The Witcher Bestiary - Skullhead
Skullhead Occurrence: These creatures died out centuries ago.

Immunity: Their strong skulls guarantee resistance to stun attempts, while their low center of gravity makes them hard to knock down.

Susceptibility: Sensitive to silver.

Tactics: Skullheads make use of their stout arms to stun and knock down their opponents.

Alchemy: Beast liver, beast fangs, skullhead talons and tendons.

Archeological research is the only source of knowledge about skullheads. Skeleton reconstructions make it possible to describe the creature's appearance and movement. Addressing his students, Professor Sendivoy Barren summed up research on the skullhead thusly: ‘We are more than lucky that the bastards died out.'