These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
A common enemy in Mt. Ararat is the "Fair Carrot". This name is pretty clearly ironic, as it likes to use unblockable instant death spells. And prefers to target the only member of your party with a resurrection skill. And always attacks in groups. Mt. Ararat is far enough into the game that revive items are merely overpriced rather than impossibly expensive, but most first-time players likely won't be bringing more than five of them into the dungeon.
Game Breaker - Eddie's Overdrive and Combo Attack skills are gained near the very beginning, and can annihilate bosses in just a few rounds even quite a ways into the game. By the time it stops being as effective on bosses, you've gained your plot-unlocked ultimate attacks.