characters transformation help ness stuff thing

[OliveBread]

I'm making a character that's technically possessed by a demon, however, they still have control

they just have an insanely strong mental barrier that prevents it from taking control, but they still have demon powers and etc

my idea is that when they reach 0 sanity (they only have 30) their mental barrier weakens, and the demon overtakes their BODY(not their mind)

with this in mind

how do I make them transform when their sanity hits 0? nothing except that they get a stat change, sprite change, and lose the ability to speak, only saying one of a few things instead of any speech. also, I need it so that this form stays until they get 20 sanity or above, in which they revert to normal

help is much appriciated

[Leonardo Cox]

use inst:ListenForEvent("sanitydelta", yourfuctionhere)