Vorpal Strike

Improved Critical (PH) (unarmed strike) , Improved Unarmed Strike (PH) , Keen Strike (EL) , Stunning Fist (PH) , STR 25, WIS 25, ki strike +3,

Your unarmed strike is considered to be a slashing vorpal weapon. (At your option, any unarmed strike can do bludgeoning damage instead, but it loses the vorpal quality.) This ability doesn't stack with similar abilities (for instance, if some other effect has already granted your unarmed strikes the vorpal quality).

Your unarmed strike is considered to be a slashing vorpal weapon. (At your option, any unarmed strike can do bludgeoning damage instead, but it loses the vorpal quality.) This ability doesn’t stack with similar abilities (for instance, if some other effect has already granted your unarmed strikes the vorpal quality).

Your unarmed strikes can behead your opponents.