Decapitate

The skill allows its user to dismember the head of their victims. Creatures or players with this skill will have a chance to decapitate targets whenever they would perform a dismembering action, killing the target instantly unless the target has more than one head or level 10 Regeneration.

Additional Sources of Decapitation

 * The Decarbonizer beam.
 * The fatecaller relic weapon mod.
 * The faction slayer relic weapon mod.
 * The  and   wishes.