Creeper

A Creeper is a mob that is hostile in the Lost Sanctuary, but passive in the Creeper's Hideout, as they think the player is a creeper. In the Lost Sanctuary, it will blow you up if you are close enough. You can only find creepers in the Creeper's Hideout near Thomas's village in the Pigmen's Ravines, and in the Lost Sanctuary dungeon. The only way to enter the Creepers' Hideout is to get a Creeper Mask from the Mask Merchant in the Hidden Village for the quest Creeper Infiltration.

Trivia

 * In the quest Creeper Infiltration, people in Pigmen's Ravines think Thomas is crazy when he told them that he saw a Creeper, indicating Creepers might have become extinct in Wynn Province