Feral slimes are Pink Largos that have angry faces and flashing red indicators that let you know they are unfriendly. They bite you like The Tarr and deal 20 damage, and the Pink Rock Largo can intentionally spike you. They spawn mostly at near warning signs except for the ones in the Moss Blanket. Each spawn point spawns a different Feral Largo Slime. The canyon spawns Pink Rocky Largos, The one on the land bridge leading to the Moss Blanket spawns Pink Phosphor Largos, and the one in the Moss Blanket spawns Pink Boom Largo.
Pink Phosphor Ferals only appear at night.
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A feral slime can be calmed down by feeding it any food, since they are pink. They'll stop attacking you, but they may still follow you around.