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.
Blue and Orange Morality: A middle-aged man wedding and impregnating a prepubescent youth? Typical. A farm dedicated to breeding and slaughtering purchased slaves for meat? Nobody will bat an eye. Committing casual murder will range from being given no response at all if a lowly beggar to being given a few wary glances at worst if you kill somebody important (like say, the King of Palima), but get caught pickpocketing and it's warrant enough for you to be killed on sight. And you're free to repeatedly kill the King of Palmia... until you kill him too many times, and then the guards get angry.
Game Breaker: With sufficient amounts of hunting or luck, you can acquire a Rod of Domination. Use that to dominate a Gold Bell. Genetically modify the gold bell 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.
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.)
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 start to beginning.