I personally love huge info dumps about everything, but if you were to focus on a single aspect it would probably be drops.
Most important info would probably be drop chances for certain loot and the amount the enemy gives so players can make better decisions on what to target. I didn’t even know about the Superboss category before you mentioned it, so having grouping for enemy types would be helpful and easier to present. Don’t forget to include special event mobs like Pinatas and Gift Critters, which notably can drop bombs as well. I also know that the amount of loot an enemy drops increases the lower the game timer is, which might make presenting this info a bit more difficult.
Kind of unrelated, but also worth noting that the loot tables for terrain elements like quicksand, snowmen, beach dirt piles, and possibly others have the chance to drop keys, so players might want to know the probabilities there too.