Unidentified Fallen Object
This is IGN's Guide of Unidentified Fallen Object. In this Unidentified Fallen Object guide, you'll find strategies for the boss fight and tips and tricks for the dungeon. However, keep in mind that demi-dungeons in Nobody Saves the World are procedurally generated, meaning that it will be somewhat random for everyone!
The Unidentified Fallen Object demi-dungeon is not something you haven't seen. It offers the same thing you find in earlier demi-dungeons. No gimmicks or anything, just pure beat 'em up.
There's nothing much this demi-dungeon offers in terms of new enemies aside from the skull bomb enemies. These skull bombs are going to run up at you and explode so make sure you're always moving to not get yourself caught up in the explosion.
That being said, make sure you're using forms you haven't used before so you're constantly receiving those stars from their quests. Any form should suffice in this demi-dungeon. If you want to clear this demi-dungeon quick, the Rat is recommended as detonate poison is a really good ability in general.
Unidentified Fallen Object's Boss Room
Unidentified Fallen Object's Boss Room is a small arena where a bunch of monsters will be spawned in waves. Again, nothing really novel here. This boss room favors forms that deal AoE damage like the bodybuilder, the Rat, the Magician.
Anything really that deals AoE damage as most of the time, the enemy would be chasing after you. You can just kite them and then kill them. If you want the direct approach, you can use the Horse or the Rat. The Rat's detonate poison will make quick work of EVERYTHING in the boss room. The horse takes a little bit of getting used to as you need to be facing the opposite way to hit its signature ability, but equipped with the bodybuilder's passive, the Horse can deal lots of damage in times where there's a lot of mobs present.
If you're having trouble with the skull bombs. Remember that you don't really need to kill them! Simply move near them and then use the Ranger's Dodge or juke them with your movement. They're programmed to just explode when you're near them!