Annoying Video-Game Helper: Any pet who doesn't have the "Control Magic" skill but has multi-target spells. Control Magic prevents spells from hitting allies, so a pet not having it makes spells hurt you and your other pets in addition to your enemies. Especially annoying when the spell is fire or ice elemental, since getting hit by these spells has a chance to destroy a random item in your inventory.
With sufficient amounts of hunting or luck, you can acquire a Rod of Domination. Use that to dominate a Gold or Silver (Platina in Elona+) Bell. Genetically modify it to boost its level and give it extra limbs, then give it a shuriken (one that preferably nullifies poison). Pick a fight with a monster that's stronger than you. Laugh when your new best friend cuts it to shreds.... Or just give one Lulwy's gift weapon, The Wind Bow. The ether won't affect it, no modification required, same results.
Playing the blackjack games enough times will net you enough potions of cure corruption to trade/sell for anything a wandering adventurer might have. And then you can steal them back on top of that. (however, you'll need new potions as their base value changes once given the stolen flag.)
Once you get a deed of shop and high enough tailoring to mass-produce panties with a sewing kit, be prepared to increase your gold gain by several orders of magnitude. A small pile of panties will bring in around a million gold, while getting 100k before that was a struggle. This was severely nerfed in an Elona+ patch, which removes the ability to craft equipment with the sewing kit.
Germans Love David Hasselhoff: Most Japanese Elona players loathe Elona+ and its creator, just mentioning it is asking for a Flame War in many Japanese Elona communities. It mainly has to do with the excessive anti Save Scumming measures and the story for acts 2 and 3 not being up to snuff and being even more Reference Overdosed than vanilla Elona. Despite the new content never receiving a full official translation (or perhaps because of this), this is not the case with western Elona players, who enjoy most of the new content from a gameplay perspective, and it's more popular than vanilla or omake Elona. It helps that the Fan Translation removes some of the gameplay features that were disliked by the Japanese community, and most don't care about the story and dialog all that much to begin with, and most of it wasn't translated for a long time.
Most Wonderful Sound: The small chime that plays when one of your stats or skills level up, and the three flute notes that play on a payday or when your potential improves.
Food has a random chance of being cursed, which causes you to vomit and become hungrier when eaten. Having to waste money and time on identifying your food to just so you can know it'll work as intended is quite annoying.
From Elona+, hydration. It works similarly to hunger, although instead of dying, failure to hydrate your character will drain your stamina, slowing your character to a crawl. While it's intended to prevent you from spamming potions during combat, the end result is that you're forced to periodically waste potions in order to keep your character hydrated. It's to the point where there are mods to remove hydration completely.
Squick: You can get pregnant even if your character is male. On top of that, you actually give birth to aliens, which are hostile NPCs. If your character is pregnant, you can cure it easily though, drinking poisonous potions (like the cheap dye) or vomiting will get rid of the nasty chest burster.
That One Attack: The final boss of Elona+'s Act II has the "Super Regene" ability which will instantly heal a large chunk of its HP and drastically boost its life regeneration once you damage it enough. Your best hope is to get it to just above the threshold that will make it activate the ability, and then activate as many buffs as possible before unleashing your most powerful attack so you can hopefully remove the remaining HP in a single hit.
The spin-off Elona Shooter provides examples of:
Game-Breaker: Gravity Gun, Gravity Gun, Gravity Gun. This Ball-Of-Death shooter is indispensable to getting the Chosen One medal The change in difficulty once you get this is so big, you go from struggling on the previous days to breezing through the following levels. A lesser extent is the Crossbow that could shoot through mobs, hitting multiple times on big targets, making Hunters a solid choice from the beginning.
For starters, the enemies include: egg-flinging chickens, sheeps, running rats, rats parachuting from pteranodons, bomb-carrying strawmen, kamikaze eagles, ballistae, tanks, walking dragons and flying dragons.
Your assortment of weapon is mostly standard firearms: pistols, revolvers, grenade launchers. And then you have the Gravity Gun (which shoots an energy ball of hurt across the screen) and the various bows, crossbows and bowguns.
At the town, you can raise chicken and collect eggs to sell for money. Other methods include killing people at the local museum, taunting enemies (so they get stronger, but you receive more rewards), etc
You can buy "sisters" (i.e bomb-carrying little girls) that are deployed at the beginning of the level, and can be shot at to damage enemies nearby. They are regenerated after each day. Also, with the skill "Love", you can also get compensation for their "deaths".