[Scripting Question] Attack Effectiveness Ability

[Dragonite2963]

I've been trying to add a new ability that modifies the effectiveness of certain type attacks and boosts your STAB.
The boosting STAB part was simple enough, but I can't for the life of me figure out how to make certain attack types supereffective against a Pokemon with this ability.

I tried modifying Scrappy like so:

Scrappy:

   if attacker.hasWorkingAbility(:SCRAPPY) || opponent.effects[PBEffects::Foresight]
      mod1=2 if isConst?(otype1,PBTypes,:GHOST) && PBTypes.isIneffective?(atype,otype1)
      mod2=2 if isConst?(otype2,PBTypes,:GHOST) && PBTypes.isIneffective?(atype,otype2)
      mod3=2 if isConst?(otype3,PBTypes,:GHOST) && PBTypes.isIneffective?(atype,otype3)
    end

My Ability:

   if attacker.hasWorkingAbility(:VAMPIRISM)
      mod1=4 if isConst?(otype1,PBTypes,:FIRE) && PBTypes.isNormalEffective?(atype,otype1)
      mod2=4 if isConst?(otype2,PBTypes,:FIRE) && PBTypes.isNormalEffective?(atype,otype2)
      mod3=4 if isConst?(otype3,PBTypes,:FIRE) && PBTypes.isNormalEffective?(atype,otype3)
      mod1=4 if isConst?(otype1,PBTypes,:STEEL) && PBTypes.isNormalEffective?(atype,otype1)
      mod2=4 if isConst?(otype2,PBTypes,:STEEL) && PBTypes.isNormalEffective?(atype,otype2)
      mod3=4 if isConst?(otype3,PBTypes,:STEEL) && PBTypes.isNormalEffective?(atype,otype3)
    end

But the problem is, it's now making MY moves 2x effective against Fire and Steel types. How can I make it so that Fire and Steel types are 2x effective against Pokemon with this ability?

The specifics: The ability is called Vampirism, and it causes Fire and Steel type moves to be super effective against you.

Thanks so much!

 

[Dragonite2963]

Never mind, I figured it out. It was as simple as

    if opponent.hasWorkingAbility(:VAMPIRISM) && atype==getConst(PBTypes,:FIRE)
      mod1=4 if mod1==2
      mod2=4 if mod2==2
      mod3=4 if mod3==2
    end