Fire deals more damage!

[Onyx]

Yo, its me again

So my question today sounds: how to add weakness to char?
For example i want to deal more damage with fire to a specific char, i wrote
this

Code:

<frame> 203 fire
   pic: 78  state: 18  wait: 1  next: 204  dvx: 0  dvy: 0  dvz: 0  centerx: 39  centery: 79  hit_a: 0  hit_d: 0  hit_j: 0 mp: 5000
   wpoint:
      kind: 1  x: 42  y: 46  weaponact: 21  attacking: 0  cover: 0  dvx: 0  dvy: 0  dvz: 0
   wpoint_end:
   itr:
      kind: 0  x: 22  y: 35  w: 26  h: 19  dvx: -6  dvy: -6  fall: 70  vrest: 70  bdefend: 16  injury: 30  
      effect: 20  
   itr_end:
   bdy:
      kind: 0  x: 22  y: 35  w: 26  h: 19
   bdy_end:
<frame_end>

mp: yyxxx
x = MP lost
y = HP lost

Then that should works (-50hp and -0 mana), but nothing happen when that char is on fire.