Destroying Enemy TP

[Zero0018]

I have a skill that I want to have -TP on the enemy. How can this be done? I could call a common event and add a state to the enemy target, but that would remove a % of TP right? How can I do a flat amount that occurs 1 time on ability use?

 

[Andar]

add it to the damage formula:

b.tp=b.tp-10;a.atk * 2 - b.def

 

[Zero0018]

add it to the damage formula:

b.tp=b.tp-10;a.atk * 2 - b.def

TYVM