The Witcher Bestiary - Bloedzuiger
Bloedzuiger Occurrence: Swamps and marshes.

Immunity: Immune to poison; low resistance to stun attempts.

Susceptibility: Sensitive to silver and fire; the Strong Style is most efficient against bloedzuigers; experienced witchers warn against using the Group Style while fighting multiple bloedzuigers.

Tactics: A dying bloedzuiger explodes, spraying acid on its opponent; a skilled witcher is able to kill the monster while evading the explosion.

Alchemy: Abomination lymph, Albar's Crystals, bloedzuiger blood.

The bloedzuiger, a grotesque monster from the swamps, causes terror among peasants because it pours digestive juices over the wounds of those who are still alive and then dines on their half-digested intestines.