PvP Balance

[lupus]

I'm trying to create a balance that more classes the opportunity to succeed in PvP. 

So I want to create a PvP Room Special. I have found a file which can block the use of certain Skills. But there is some possibility of "nerf" Skills in this map? Thus creating a balance in PvP without harming PvE? 

Just add this map cooldown on potions. Reduce the damage of Skills in percentage? And who has more suggestions on how to make a good balance, let me know.

[Capuche]

https://github.com/rathena/rathena/blob/master/db/skill_damage_db.txt