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.). Any creature killed by this attack is disintegrated and everything it is wearing & carrying except magic items is disintegrated. 

When using the slashing unarmed strike, your critical threat range is quadruple. For example, your  unarmed strike threatens a critical hit on a roll of 17-20 (four numbers).

When utilizing this technique, you’re slashing unarmed strike bypass immunity to critical & Slashing. Damage from slashing unarmed strike can’t be prevented & regenerated from. Creatures on the ethereal plane can be damaged by you’re   slashing unarmed strike attack.

You’re slashing unarmed strike deals double damage to objects and structures. Spending Ki points equal to the spell lvl, you can slash through magical barriers & spells, while also nullify its effect for one minute. You do not take damage from interacting with said magical barriers & spells when performing this action.