That One Boss: Super Robot Wars

NOTE: Final Boss and Wake-Up Call Boss cannot be That One Boss without being overly hard by their standards. Please do not nonchalantly add them as examples. Bonus Boss is completely banned, as they're supposed to be an overly challenging boss.

  • Super Robot Wars Advance
    • Master Asia is a tough opponent to hit at the best of times, has two seperate Hit Point bars thanks to his mount Fuunsaiki, and in his final encounter will be Regenerating Health infinitely unless players knock him down from approximately half his Hit Points to zero in a single attack. Without an allied character with the Spirit Command "Valor"note , it's definitely one of those easier-said-than-done things. There's a reason he's called The Undefeated of the East. The first encounter with him is especially notable as he's the first opponent in the game to possess a strong MAP Attack and he uses it at every opportunity. He's significantly easier in the PlayStation Portable Video Game Remake due to the changes to the weapon upgrade system that makes it likely for players to have access to more powerful finishers, but is still extremely deadly if players aren't properly prepared.
    • Unlike most instances of That One Boss in this franchise, Don Zauser doesn't deal any nasty Standard Status Effects from his attacks, no damage-reducing barriers or unit abilities such as "Afterimage"note , the scenario he's in doesn't have a turn limit, nor does he possess a MAP Attack to allow him to threaten a player's units at once. What he does have have is bigger, badder numbers than anything else in the game: boatloads of HP, offset with incredibly high accuracy and evasion stats (moreso than the Final Boss), and coupled with very high damage for his attacks, Don Zauser will simply overwhelm players through sheer force; there's practically nothing one can do to mitigate his advantages. Unless players have made sure to upgrade only the units that appear after a particular route split, and are extremely frugal with their resources throughout the Marathon Level leading up to him, they will have an extremely difficult time dealing enough damage to kill him before running out of EN (energy) or Spirit Points. Even when players can keep up with his health regeneration, Don Zauser will likely be picking off allied units one-by-one. Fortunately, he's purely optional and can be evaded by taking another choice from the route split, unless they want to unlock a certain secret in the route featuring Don Zauser.

  • Super Robot Wars Alpha
    • Shu Shirakawa and his Neo Granzon in Alpha Gaiden was the hardest boss in Super Robot Wars history until he was dethroned. The Neo Granzon goes One-Winged Angel (hence "Neo"), can regenerate HP to full again and again for both player and enemy turns, gets an Extra Turn for every round AND will use it for two MAP Attacks, which do a ton of damage and may as well destroy all allied units on the field. Perhaps most destructive is the Neo Granzon's "Shukutaihou" weapon, an attack in all of its appearances almost ALWAYS guarantees a One-Hit Kill, and only those with exceptionally high armor ratings (re: Super Robots) can have a chance to survive. To give a better picture of this, in an earlier game with the Neo Granzon, the Shukutaihou's base damage is 19400, a number even higher than the Final Boss' HP.
    • Gym Ghingham and the Turn X in Alpha Gaiden is also a real bastard on "Hard" difficulty, especially if players want to consider acquiring the "Skill Point". They'll need to haul ass and destroy him, while ignoring the Elite Mooks, and pray they can destroy his Zalbak guards, all at the same time. Just to screw with players, Gym regenerates HP and EN at least once and the scenario has a ten turn limit, of which three will be spent just getting to him. How quickly Gym can be taken out largely depends on how much Spirit Points allied characters have left after getting through all that.
    • Emperor Gore in Alpha Gaiden regenerates up to SIX times with mile high HP. The asshole just refuses to die!
    • Alpha 3 has Emperor Muge Zorbados. By himself, he's not that bad; unfortunately, he's fought in the Real Robot route, thus greatly crippling players' ability to deal out tons of damage and use supers to tank hits. Secondly, a huge assortment of Mooks follow Muge, with at least a third of them being sub-bosses. To make matters worst, one of the sub-bosses mind controls part of the team from the start, forcing players to make killing this pilot a priority. Finally, after having pissed away most of the party's Spirit Points dealing with the sub-bosses and Mooks, Muge enters with 170,000 HP and can do a nice amount of damage, most likely killing off most of the weakened and/or weaker troops, with the stronger ones scraping the bottom of the barrel for ammo by this point, assuming the enemy horde haven't destroyed any allied units who can resupply allies with ammunition and EN.

  • Super Robot Wars Destiny
    • Farah Griffon. Destiny is more known for its collective hordes of evil out for the player's blood that invert the Sorting Algorithm of Evil, where most bosses are small fry compared to the Original Generation Mooks; Farah is the exception. She's in the small Gengaozo, making her hard to hit, laddled with four equippable parts to boost accuracy and evasion rates, while the machine has much thicker armor than the average real robot should ever, EVER have. Worse, she's fought after one of the most grueling levels in the game. It doesn't help that aside from the Original Generation Mooks, the Mobile Suit Victory Gundam ones are the Demonic Spiders of Destiny. Farah is the pinnacle of that mind-numbing terror, laughing off the best attacks as the party's Spirit Points dwindle to nothing, players' oft-praised, perfect aces humiliated time and time again by this woman when they can't shoot her down. All this is before her "Prevail"note  pilot skill kicks in.
    • The absolute worst boss in Destiny would have to be Gepelnitch. 200,000 HP with one-shot of full HP regeneration once he hits 50%, and a unique pilot skill that halves all damage done to it except song-based weaponry, which runs out quickly and cannot be resupplied aside from a meagre pittance of per-turn regeneration. This doesn't come anywhere close to Gepelnitch's own natural "HP Regeneration" unit ability; alternatively, players can drain him of Will to disable his damage-halving skill, but after two or three attacks, Gepelnitch will have regained enough to turn it back on, rendering player's attempt meaningless.

  • Super Robot Wars Original Generation
    • Dark Brain in Original Generation Gaiden, who so happens to be the Big Bad of the game, but not the Final Boss. Needless to say, if players don't readily prepare themselves with the "SP Regeneration" pilot skillnote  for allied characters... well, they'll have to chip away at his HP when he enters One-Winged Angel, gaining twice the amount his first form has (meaning, they're fighting a boss with an accumulated total of ONE MILLION) and can regenerate roughly one-third of it every turn. Not to mention before fighting him, there are several extremely strong Swordian Guards equivalent to that of previous sub-bosses that must be fought. Did we mention that if any allied pilot unlucky enough to get hit with his attacks, even when fully upgraded, a One-Hit Kill is certainly guaranteed? Arguably, due to his high-end HP, rate of regeneration, the existence of a second form, high armor rating and devastating attacks, this boss has become a standout example for the ENTIRE franchise, a feat not seen since Shu and the Neo Granzon in Alpha Gaiden.
    • Back in the first game, Ingram Plisken and the R-Gun Rivale, a machine with more than 100,000 HP (estimated at 150,000, but until reduced to below 99,999, the HP bar is shown as ?????), an exceptionally devastating "Axion Buster", a slightly less powerful "Gun Slave" (with a high ammo count), and a tough melee attack that consumes neither ammo nor EN. The machine also has a large EN pool to allow Axion Buster-abuse, the dreaded "Warp Field" unit abilitynote  and HP/EN Regeneration per turn. Couple this with its pilot's uncanny stats, it makes most real robots without equippable parts that increase mobility useless, while super robot attacks bounce merrily off the "Warp Field". To make matters worse, unlike boss battles afterwards, the fight against this boss doesn't give players many places on the battlefield where they can regain HP or EN, if any at all.
      • Additionally, what makes this boss difficult is due to the scenario's "Battle Mastery" requiring players to defeat the boss in as few as seven turns for the fight. The Combining Mecha SRX gained after reducing its health to a certain threshold not only lacks power (even when spamming Spirit Commands), but is only available for three turns and will fizzle like a torch when tagged with the boss' Gun Slave and Axion Buster. Oh, and the SRX's best attack is melee-based, meaning the boss won't use up any of that Gun Slave ammo.
      • Keep in mind this boss will be fought AGAIN down the road: in fact, the first time it appears, players don't even see it coming, because the Rivale was hidden in the regular R-Gun all along.
    • Also in the first game is the earlier fight against Bian Zoldark. Compared to late-game bosses, Bian's Valsion is profoundly inferior. However, it still has "Warp Field", a massive store of EN to fuel its barrier, attacks that are downright overpowered at that point in the game, and the fact players have to hack through hordes of Mooks to get to it. They also have to fight the even stronger Shu and Granzon (but only to acquire the Battle Mastery, which necessitates players to defeat Shu before going after Bian, all while the latter delivers potshots with the Valsion). At this point in the game, there's only ONE EN-reducing weapon available, which must be reloaded every two rounds - heaven help players if they didn't equip an allied unit with the equippable weapon "Resupply Module"note . To clinch this, it's unlikely many allied characters have the "SP Regeneration" pilot skill when fighting Bian, meaning it's a must when rationing off Spirit Commands, all but necessary so as to evade the Valsion's attacks.
    • Wilhelm von Juergen and the Valsion Custom Type-CF in Original Generation Gaiden (not the bonus "2.5" section of Original Generations). He appears after fighting hordes of Bartolls, each with insane evasion rates, then pits the party against a Brainwashed and Crazy Lamia Loveless, with the victory condition demanding Kyosuke Nanbu be the one to deal the final blow (almost impossible without sacrificing some Spirit Points). Finally, in comes Juergen at a whopping 300,000 HP against the drained party, with above average evasion, and since it's unlikely allied units and pilots have been upgraded (either because players are saving for a bigger investment or the fact the game jumps frequently from one point-of-view to the next, making upgrades and Pilot Points sparse), they might not get someone with "SP Regeneration". Just to rub it in, Lamia is unavailable as reinforcements after rescuing her and before even starting the battle with Juergen, any remaining Bartolls might still be around to further harass the party.
    • Perfectio in the Second Original Generation, as a result of Marathon Level. If players want the "SR Point", they have to deal with all current Mooks on the map before defeating Ignis. Simple enough, but then must face off against Umbra with Mook reinforcements. Again, still simple, and once Umbra's gone, Perfectio finally appears. At the start of every turn, he automatically reduces the entire party's Will, his Fatum has an exceptionally large EN pool, making it futile to burn it away to prevent him from using the Fatum's strongest attacks, can move twice and worst of all, regenerates HP to full TWICE due to in-game events. Compared against the AI-1, Son Ganlong, the Final Boss and True Final Boss, Perfectio is That One Boss for this game. Oh, and did we mention that unlike its predecessors, the Second Original Generation prevents any purchase of the "SP Regeneration" and "Attacker" pilots skillsnote ?
    • AI-1 is a stepdown from Perfectio, but it has HP Regeneration, the "Counter" pilot skillnote  and weapons that reduce units' mobility. However, what's unique about the AI-1 is players cannot drain its EN dry because of its exclusive unit ability turning 1% of all damage received into EN, making its "TE Sphere" damage-reducing barrier operating almost 100% of the time. Combined with the fact that barrier-breaking weapons are less commonplace in the Second Original Generation, the AI-1 can be a hassle, but nowhere as frustrating as Perfectio.
    • Son Ganlong is really a Damage-Sponge Boss; however, if the player is attempting the SR Point, be prepared for a marathon. Granted, Kukuru pulls a Heel-Face Turn in this scenario and joins the party until the end of the game, but you must contend with the KyuKiOh and TouTetsuOh again, alongside Kanan and Sandaiyuu Taihou with the JakuBuOh/BuJakuOh. Oh, and the requirements for the SR Point? "Destroy all enemies before destroying Ganlong's OhRyuOh". To twist the knife further, the KyuKiOh and TouTetsuOh have a pre-movement MAP aura that drains Will Points with one of the TouTetsOh's attack that drains Spirit Points and attacking Taihou in the BuJakuOh long enough forces him to regenerate his unit to full HP, giving Kanan the controls to the JakuBuOh (though the JakuBuOh is defensively weaker, making it easier to take down). By the time all four of them are defeated, the player has likely exhausted a majority of the party, and must deal with a size LL, barrier-enabling, MAP attacking OhRyuOh.
    • If players are aiming for the SR Point in the Hard route for the scenario against the Final Boss Nashim Gan Eden in the Second Original Generation, they have five turns to destroy the three mini-bosses, each with HP exceeding 150,000, on top of an "Ace Bonus"note  that grants S-ranking adaptibility on all terrains. This forces players to throw tons of Spirit Commands when dealing with them; however, leave just one with little HP remaining at the end of the player's fifth turn, and the Final Boss appears on the enemy turn, who automatically heals all enemy units on the battlefield by 50% of their HP, rendering players' efforts moot. Even if they don't aim for the SR Point, the recovery still produces problems. As for the boss itelf, it has a barrier with similar properties to Warp Field, including an exclusive barrier bonus that further reduces damage, determined by the number of enemy units left on the field. Its strongest attack also drains EN.
    • The True Final Boss of the Second Original Generation, Euzeth Gozzo, in addition to summoning previous mini-bosses fought in the game, has a unit with a similar EN-absorbing ability as the AI-1 (though it spends EN much less than the AI-1; instead, most of its weapons are ammo-based), and the boss has a very nasty ability that allows him to move three times per turn after his Will exceeds 160. Furthermore, he's one of the few bosses in the game with the "Revenge" pilot skillnote  and his unit's MAP Attack, if successfully hit, prevents allied characters from using Spirit Commands for a turn, rendering defensive Spirit Commands cast against MAP Attacks pointless. Combined with a very high accuracy rating, S-ranking for all terrain adaptability, maximum level "Prevail" and level 9 "Telekinesis"note  pilot skills, he is close, but not enough to edge Dark Brain off of his throne.
    • The Final Boss Qepaloc Narmo for the Dark Prison Downloadable Content. Granted, it's just a battleship, until players realize its size is "LL", while the rest of the party contain units from size "M" to "L". Secondly, the boss has tons of Mooks, forcing players to inch their way through to get to him. Next, he can attack twice, with an Ace Bonus allowing him to cast the "Zeal" Spirit Commandnote  at the start of the enemy phase when his HP reaches below 30%. Its MAP Attack is ammo-based, boasting 30 rounds, to which he WILL use every single turn. Finally, the party consists of only ten units available: four to begin with, three are Guest Star Party Members and their units cannot be upgraded, and the rest aren't available at the start of the scenario. Not only do players not get enough room to breathe, but if any ally is destroyed during the scenario, it's an automatic game over. All this is before any mention of EX-Hard Mode where suddenly, it can actually hurt the Neo Granzon. Needless to say, prepare for a slug fest.

  • Super Robot Wars UX
    • Don't let the full recovery event fool you, but Kali Yuga is probably one of the hardest bosses for SRW handhelds. First off, all of its attacks inflict Standard Status Effects (one of which halves pilot's stats), meaning without someone like Fei-Yen HD using her Tactician Bonus "Spiritual Fortitude"note , players are likely screwed. Secondly, due to most of allied units' having a size rating of "SS" to M (with just a few being size L), the boss towers with the extremely rare size of 3L, meaning the largest defensive and offensive bonuses in the game. Combined with a list of pilot skills such as a max level "Prevail", "Guard"note  and "Counter", alongside high armor and stats for everything, even if players fully commit to using Spirit Commands against it, without a high enough evasion rate, it can attack first via "Counter" and reduce allied attackers' stats by half, rendering their attacks pointless. The catch for the fight is players must fight another boss beforehand (which is no cakewalk, either) and they have to deal at least 30% damage to the Final Boss in order to trigger the Heroic Second Wind event. Given the gameplay system of UX (no equippable parts and fewer Spirit Points for sub-pilots) is pretty different from handheld titles before it, this makes Gaiou look incredibly easier.

  • Super Robot Wars W
    • Although players often consider handheld titles (especially those on the Gameboy Advance and Nintendo DS) a lot easier than console installments, there are a few spikes that can hurt. For example, Gauron: in this game, he will be fought three times, the former two requiring some real tough nuts to crack. To eleborate, his mecha (be it the Codarl or Venom) has some really nasty long-ranged attacks (along with his "Combo" pilot skillnote ), the "Lambda Driver" unit ability can reduce damage and is an equivalent of "Afterimage", Gauron can reach up to 170 Will, and worst of all, HE WILL USE SPIRIT COMMANDS ON EVERY TURN (namely "Focus"note  and "Zeal") and has "Prevail", too. Quite a chunk of players consider this sadistic bastard even stronger than the Final Boss for W, given the situation. Below are the breakdowns of the two hard encounters:
      • In Scenario 9 of the Earth Route, the units available are those from the Gutsy Galaxy Geoid, Mithril, the colony Gundams and the Original Generation. That's not too bad, considering the units contain the largest number of Game Breakers in W, except it's still early in the playthrough, and their Spirit Points are limited (including the amount of upgrades players have probably not invested yet), meaning they're unlikely to frequently use the "Strike" Spirit Commandnote . The key to defeating Gauron, Mic Sounders (who has a weapon that reduces enemy mobility by 50% for one turn), probably spent most of his Spirit Points to survive the onslaught earlier before The Cavalry arrives. Since the scenario takes place on a base, if Gauron moves onto the base structures (via normal movement or in-game events), he'll gain HP/EN regeneration, including defensive and evasion buffs, from the buildings. If players are playing normally, they won't have any means to reduce his Will. Even after that, players must contend with Chang Wufei in the Altron Gundam and Trowa Barton along with enemy reinforcements, while Sousuke Sagara, Kurz Weber or Heero Yuy must survive the scenario. There's a reason why experienced players tell newcomers to W to choose the Space Route instead of the Earth Route for the first route split of a playthrough.
      • The second time Gauron appears is in Scenario 35. Team-wise, players are in better shape than before (thanks to the rest of the Gutsy Galaxy Geoid and the Tekkaman Blade bunch), and plenty characters have learned the "Strike" Spirit Command. Of course, before fighting Gauron, a group of Elite Mooks must be dealt with first, but if overeager players think about taking Gauron out ASAP, think again: damage him once and he'll regenerate HP to max AND instantly cast "Strike" and "Valor" immediately. If allied units are sticking together (especially Sousuke or Melissa Mao, who cannot die in this scenario), they're going to get hurt badly because of Gauron's "Combo" pilot skill.
      • Fortunately, the third encounter in the next scenario is far easier, as Gauron stops casting Spirit Commands.
      • Some players argue Gauron is just as difficult in Super Robot Wars Judgment compared to his counterpart here: while he cannot spam Spirit Commands in that game, his stats are roughly above 200 and the "Lambda Driver" ability for his mecha are just as effective there. The only units most likely to hit him without using Spirit Commands are Yuu and Hime using the cost-effective "Chakra Extension". Additionally, the Venom does not regenerate HP, nor are there any HP/EN regeneration panels on the battlefield when he appears in scenarios. Compared to W, he is slightly easier in Judgment.

  • Super Robot Wars Z
    • The Final Boss The Edel Bernal, if Rand Travis is chosen as the protagonist. The difficulty curve of a Z playthrough varies between average to decently hard to easy through use of Game Breakers, but the Final Boss is much, much harder than anything before him, including the Overdevil. He has the highest HP in the game (250,000 to 400,000 depending on the difficulty; Z doesn't allow more than 30,000 points of damage dealt, even when using the strongest attack in the game stacked with buffs), has HP Regeneration, the usual assortment of overpowered ALL and MAP Attacks, can move twice and earns an additional +2 Will every time when hit, enabling the use of both MAP Attacks (one at 110 Will, the other at 130). On Hard difficulty, he gains five rounds for each MAP Attack, the stronger one now requiring only 120 Will. To top it off, players must fight TWO OTHER COPIES OF HIMSELF, each with the same skills, statistics and weaponry. But it doesn't end there: to achieve the victory conditions, the Final Boss and his copies must be destroyed ON THE SAME TURN or they'll regenerate HP to full. Like Perfectio in the Second Original Generation, the final scenario is a Marathon Level, a very long 3-part map which begins with a tough boss fight, followed by a barrage of Mooks with no intermission in-between. Woe befall the poor player who used their consumable, equippable parts or wants to rearrange their squad formations. Since Save Scumming is likely going into effect, the scenario can become Unwinnable very easily if slipped up once. Imagine doing this on "EX-Hard Mode", where all upgrades to pilots and units are barred...
      • The Final Boss becomes laughably easy if Setsuko Ohara is the protagonist, since there are no copies, only a statistically stronger version of him. Because he only has A-rank for terrain adaptibility, allied units with S-ranks will be a lot safer.
    • With Full Metal Panic! appearing in Jigoku-hen, players knew Gauron would retain his status, and that he does: appearing as earlier as Scenario 8, he comes fully-decked with "Prevail", "Guard", "Counter", and "Ignore Size Modifier". With his Codarl's "Lambda Driver", the only unit to really take a few hits at this point in the game is the Mazinger Z, while the most effective way to damage him is through "Maximum Break", which is tricky to use if one still hasn't grasped the "Tag Tension System". Some players likely start upgrading Sousuke's M9 so that he can stand on his own against Gauron and for future reappearances. Sorry to the bearer of bad news, but his M9 doesn't share upgrades with ARX-7 Arbalest.
    • Original Generation bosses throughout the Z series aren't generally hard, barring some of them depending on the playthrough (such as a Level 99 Gaioh from the Second Z), but Gadlight Meonsam and the Geminia in Jigoku-hen is an exception. His pilot skills are nothing short of impressive: "Genius"note , max level "Telekinesis" and "Counter", and a level 8 "Prevail". His Ace Bonus automatically casts the Spirit Command "Strike" at 130 Will, and worst of all, can take THREE ACTIONS PER TURN thanks to the "Triple Action" pilot skill, which he's sure to blast the party well away with his extremely wide-ranged and powerful MAP Attack. Oh, and if players believe scattered Mooks among the map can protect the party from his MAP Attack? No: he will just use it like nothing.
    • The Anti-Spiral and the Grand Zamboa is similarly difficult, with pilot skills largely the same as Gadlight, a wide MAP Attack with indiscriminate fire included (though it only moves twice per turn and its "Preveil" level is at 7). Unfortunately, the Anti-Spiral takes a page from Perfectio, with its Ace Bonus reducing allied characters' Will by 5 each turn. Due to in-game events, the size of all units are locked at "infinite", making not only the "Ignore Size Modifier" pilot skillnote  meaningless, but the fight completely depends on statistics, unit upgrades and Spirit Commands. Meanwhile, the Anti-Spiral has incredibly high base stats, will immediately attack the party on the first turn, and to acquire the SR Point, its HP must be reduced to 99,999 within 4 turns. There's a good reason this is the Final Boss of Jigoku-hen.