Decayed were added with the Swamp makeover.
Decayed will spawn in the swamp water a night.
Decayed will attack the player on sight. Decayed will follow the player from the water and chase on land if need be.
Decayed always spawn with a shield enchanted with the Curse of Decay. They will block with this shield.
The shield can take up to 30 points of damage before breaking.
Decayed will drop: 100%, 0 - 2 Rotten Flesh 5% 1 Slime Ball