Hi. It's a gold way to easily edit your skills damage if you are trying to balance your server.
Using this method, you can remove/add damage only for PvP/GvG/BM, then the players will do the original damage in mobs.
db/pre-re/map_zone_db.conf or db/re/map_zone_db.conf
Sample 1 - PvP:
What that means: working of PvP maps (pvp mapflag)
ASC_BREAKER (Soul Breaker) will have 150% damage (50% more damage) (If the damage was 10k, then now it will be 15k)
CR_ACIDDEMONSTRATION will have 50% damage (50% less damage) (If the damage was 20k, then now it will be 10k)
Now you can do the same in " /* GvG zone is applied to all maps with a gvg mapflag */" and " name: "GvG2"" or in what you want. But these will make changes for PvP and WoE1/WoE2.