Centaurs are enemies in Hexen. They are outfitted with armor, swords and a shield which has a skull face on it. Centaurs possess 200 hit points each.
Centaurs are particularly weak to the Cleric's poison gas clouds (used via the fléchette) and when affected will be put into a stasis state until the gas cloud wears off. The flechette is also probably the most efficient way to kill them when playing as the Fighter or Mage.
The Slaughtaur is a variant of the Centaur.