[@Balthazar007]
[b]Edit: sorry, didn't mean to send the message yet[/b]

Ah okay. 
So like in that last fight, it would have been: Anusobeket gets a -50% modifier, thus effectively canceling her STAB for the next turn?
Sounds good to me boss!
Does this also mean that moves that Raise a Stat [b]and[/b] Deal Damage like Power-Up Punch would deal damage and just add the effects on the next turn only then? Or would it be like healing moves and be cut 50/50?

What about Multi-Hit attacks?