Monsters

Creatures:
Standard monsters that are found to fight on floors. Usually give basic crafting materials and are standard form of XP grinding.

Field Bosses:
Hard Creatures found in the "fields" of the floors. Usually quite a bit harder to solo, and can drop some rare items.

Bosses:
Hardest monsters in the game. Usually cannot be beaten solo unless well above the level of the boss, or with multiple healing chances. Killing them progresses players to the next floor, and adds a new permanent teleporting option.