I'm looking for some info, I want to make a buff mod on my server Its a "2013db"

I dont know this type is even exist on L2.
I want to make freezing & burning skin to a spec skill.
The im trying to do, is not to give reflect damage, i want to make them to give the attacker a debuff slow, freez, burn etc.
It can be done?
I made the trigger skills, but when the trigger, its casted on the caster, so i stuck here.
Thx, fowardly