Monsters, also known as enemies, are NPCs that pose a threat to the player as they deal damage and can kill the player. There are many monsters, but Hardmode monsters are much tougher than Pre-Hardmode monsters.
Critters (Pre- and Post-Hardmode[]
Critters are monsters that will not attack or damage the player.
- Cardinal
- Blue Jay
- Bunny
- Goldfish
- Squirrel
- Butterflies (Many varieties, view page for all types.)
- Duck
- Mallard Duck
Underground Monsters (Pre-Hardmode)
- Bat
- Skeleton Miner
- Giant Worm
- Cochineal Beetle
- Nymph
- Skeleton
- Slime Monsters (Black, Mother, Baby)
- Tim (Rare)
- Undead Miner
- Vampire Miner
Underground Jungle[]
Underworld Monsters[]
These will attack, and most likely kill, a newer player, so beware!
- Lava Slime
- Voodoo Demon
- Bone Serpent
- Arch Demon (Stronger variant of a Demon, also drops Crystal Shards.)