Headbutt

is the name shared by several class-specific skills.

Different classes have specific versions of this skill that may be customized with talents and other skills:
 * Assassin
 * Blade Dancer
 * Blade Master
 * Destroyer
 * Force Master
 * Gunslinger
 * Kung Fu Master
 * Soul Fighter
 * Summoner
 * Warden
 * Warlock