Purple Slimes are a variation of slimes found in Forests during the day. They are larger and stronger than the Blue Slime. They cannot spawn within 400 tiles of the world's natural spawn point, unless in Expert Mode. Purple Slimes will not usually target the player, but will become aggressive when damaged, during the night, or if brought underground.
Like most other slimes, the Purple Slime will be passive towards any player with the Royal Gel accessory equipped.