Best Boss Ever: Common consensus among the endgame fanbase indicates the Twilight Archmage to be this.
Broken Base: On many, many many things. Pets, 16-bit sprites, using Reddit as a primary communication platform... the list goes on.
Possibly the biggest one is dragging and leeching. A common tactic for poorly-equipped or low-level players when entering a dungeon is to sit in the entrance to the dungeon and wait for the better player to reach the boss room, where they teleport to the boss to try and get some of the loot. In response, some players will collect a large group of enemies and kite them on top of the leeching player, often in far too large groups for the leeching playerr to deal with. Whether either of these attitudes are justified is a common hot point among fans, so bring it up at your own risk.
Demonic Spiders: Medusas, Ghost Gods, and Leviathans are the Demonic Spiders of the Godlands- Medusas and Ghost Gods have incredibly powerful shotguns that pose a significant threat even to endgame players, while Leviathans spray bullets everywhere while being very difficult to hit.
Brutes from the Abyss of Demons- they move extremely fast, do a lot of damage, and like hiding around corners. In large groups.
Hellhounds are similar to brutes except their shotgun is even stronger and inflicts Bleed, but they usually don't gang up in such large numbers.
Sea Mares from the Ocean Trench are the only real threat to maxed characters in the dungeon- they shoot devastating paralyze bullets that leave you stuck for as long as five seconds in a dungeon with an Oxygen Meter, and are accompanied by swarms of smaller Sea Horses that will happily shred your HP bar in seconds.
Basically everything from the Shatters, but in particular the Fire and Ice Adepts, and the Forgotten Ice Mage. The Adepts move very fast, inflict great damage and a lot of statuses (Ice Adepts in particular inflict a souped-up from of Blinded called Darkness, Slow, and Confuse) and spawn portals that spray out shots in a 360 degree radius across a very large area- and to top it off, they have HP greater than most dungeon bosses!note they have ''10,000 HP each- that's as much as Malphas! Ice Mages aren't nearly as threatening initially, but they spawn Ice Spheres that are basically One-Hit Kill incarnate- if an Ice Sphere sits on you, you're dead. Their Action Bomb -esque final explosion is even worse- each tiny white shot does 300 damage. Eating the entire shotgun deals well in excess of '5000' damage.
Fanon: Pretty much all of the game's lore is this.
Game Breaker: The Spider Den dungeon formerly made it too easy to level up, allowing a player to increase from level 1 to level 10.
The best healing spell also used to fully heal everyone on the entire map. One priest could cast it two or three consecutive times without mana potions.
Pets, or at least high-level Heal/Magic Heal pets. Levelling the Heal ability to level 100 (The highest possible) results in the pet healing you for 90 HP... every second. This means that many situations that would previously have been lethal are now cakewalks due to enemies simply being unable to kill you faster than your pets can heal them. Magic Heal is similar, if slightly less effective, healing you for only 45 MP per second, but this is still enough to let every single character spam their ability to no end.
As a direct result of pets, sword classes (Particularly the Warrior and Knight) have become this. Their dangerously low range in exchange for incredible offensive ability previously made them a high-risk high-reward class, with their high defense only allowing them to spend a short time within effective sword range. With pets healing them and refilling their magic, this changed; Knights can now permanantly lock enemies in the Stunned status rendering them unable to fight back the second they close to melee range, made easier by the constant healing, and Warriors can permanantly buff themselves with the Armoured status by using the untiered Helm of the Juggernaut, skyrocketing their Defense to levels that, augmented by the high Heal power of pets, they can simply ignore every single shot that comes their way, even the 200+ damage ones.
The first is the derailment caused by pets- a fully maxed Knight or Warrior can basically ignore anything shot at them until they reach sword engagement range, and then sit there until their target is dead, being healed for any damage they take by something healing more than a Priest could.
The other is just a simple evolution of the game's playerbase. When the game was in its golden age, the devs were balancing content around the expectations of there only being 4-6 maxed players in a realm at one time, the majority of the players spending time in midlands or highlands levelling up.note This is, among other reasons, why the Godlands are so small compared to the rest of the realm Now, realms in popular servers are unlikely to dip below a population of 60-70, the majority of which will have at least one stat maxed. This sheer imbalance leads to even the strongest events and enemies being steamrolled in a matter of seconds- about the only things that you can reliably expect to live longer than half a second are the Avatar of the Forgotten King, the bosses from the Shatters, and Oryx the Mad God 2. And even then in a full realm you won't see them live longer than a minute or two, most of which will be their invincibility phases.
Goddamn Bats: The bats in the Manor of the Immortals; they inflict the incredibly annoying Confused status, making it highly likely you'll stumble right into Nosferatu.
Heroic Lineage: A couple of achievements imply that every new character is the child of the former character, or at least otherwise related, and thus that 'Fame' is the leveragable prestige of the family name.
Idiot Programming: The client-side of the game is programmed in AdobeFlash, making it par for the course. However, there are a number of issues that arise due to the nature of the game (Realm originated as a 1-month contest entry) that have at best been glossed over, the main one being the complete lack of database integrity or client-side security; this is why hackers and dupers are so prevelant in a game with a team dedicated to banning them.
Junk Rare: Some intentionally useless UT items, such as the ones from the Battle of the Nexus. No actual use, but look pretty cool.
Similarly, some tiered reskin items such as the Belladonna's Garden reskins or the Haloween reskins. No difference from regular tiered weapons save what they look like. Averted by the Winter reskins, due to dropping continuously for over a year.
Free itens pls. note The stereotypical begging of a player who can't actually play the game and is likely to just get themselves killed with the items by running headfirst into danger. If you use these words seriously, expect a lot of mocking from other players.
The Scrappy: Kabam!. They weren't too badly disliked after first acquiring the game from Wildshadow Studios, mostly because the game would likely have been shut down without that. Since then, aside from a few good moves such as the Haunted Cemetary and Davy Jones's Locker they have done very little to actually support the game; the Epic Dungeons are simply much harder versions of the three easiest dungeons in the game, The Shatters was designed by one of the forum-goers, the Lair of Draconis and the Ice Cave both took forever tocome out, they frequently break promises made to the playerbase, do very little to fix glitches or shut down hacking, have very poor support (often not even reading the tickets they get sent), and made a number of Pay-to-Win measures.
Most recently, they left the game completely untouched for six months. An MMO with no updates, little word from the devs, rife with hacking and cheating, a seasonal-themed Nexus that rapidly became outdated, and no word on if the game would continue to be worked on. Eventually, one of the G Ms announced that the entire dev team had been pulled away from the very active MMO to work on mobile games and "would be working on the game in the future." Two months after that and the only activity is from that same GM, who is using recycled events to attempt to breathe some life into the rapidly-ailing game. Needless to say, this has not endeared Kabam! to the game's fans.
Win the Crowd: DECA Games won the crowd just by buying the game from Kabam!. They then followed up with a month-long celebration, just to rub it in.