Thief Bat

Thief Bat is a demon found in Iris and the Giant.

"The four demons around this bat are untouchable, and can steal my cards."

Location
In Path of the Ferryman, Thief Bats can be found on Floors 15B, 16, 23 & 24 on all difficulties, and also on Floor 13 on Nightmare difficulty,

Strategy
Like the Bat, the four demons adjacent to the Thief Bat will be invulnerable to your attacks. In addition, when the Thief Bat attacks you it will remove a card from your deck.