The Witcher Bestiary - Archespore
Archespore Occurrence: Archespores grow in places where particularly cruel crimes have been committed, or on the tombs of the victims of such crimes.

Immunity: Immune to all mind effects (fear, stun, Axii Sign); they feel no pain and cannot be poisoned, blinded, knocked down or bled to death.

Susceptibility: Archespores are sensitive to silver and very susceptible to incineration attempts.

Tactics: Archespores shoot poisoned thorns.

Alchemy: Archespore juice and spores.

Some crimes are so terrible that they fill people with terror and offend the gods. The criminal's ill will and the cruelty of his deed conceive a curse that brings the archespore to life. The beast attacks innocent creatures hatefully, trying to take vengeance until justice is done.