Tendrils

"I looked on in horror as new appendages sloughed out from my body, far too many and far to easily. It was as if they'd always been."

Tendrils is a common battle Bog-Parasite for Rook, it costs 0 actions and has the effect: "While this is in your hand, gain 2 Power. Take 2 damage whenever you play a card. Expend, Parasite, Hatch"

Hatch
When Tendrils Hatches, it's transformed into a random uncommon battle Bog Parasite, so Branch, Delirium or Fever.