Twig

"Stop picking at it, it's only going to get worse."

Twig is a basic battle Bog-Parasite card for Rook, it has the effect: "When this card is drawn, take 1 damage. Unplayable, Parasite, Hatch"

Twig is obtained, together with Stem, at the start of day 2, as Rook.

Hatch
When Twig hatches it transforms into a random common battle Bog Parasite, so into Bog Brain, Neurotic Haze or Tendrils.