Like poke said buffing CHN will make them very strong like op, but main problem with the EURs are obviously wizzards, warriors, and ofc fucking clerics, for warriors id recommend not making them such a crowd control fuckers aka reducing some of their stuns, kb.
Warriors
-Dare Devil, Remove the KB
-Sprint Assault, Remove the option to get KB, keep the stun, longer CD
-Shield Crush (keep it as it is)
-Deadly Counter, Lower the stun %
Clerics
-Integrity, same CD as CHN debuff skill (cant remember the name)
-Healing orbit ... heals waaaay too quickly, id say lets it heal throughout the 15
secs (longer CD), same with healing cycle
-Bless Spell .... auf what can we say about it ... lower the phy, mag def, and imo it lasts too long
-Holy Spell Dont make it COMPLETELY immune to debbufs, make it like that they have like 20% to debuff you
-Insta healing ... Cut the healed HP by 30% (all of it)
-Soul Deity, Body Deity, Cleric that gave you debuffs CANNOT switch to a different wep, if he does, abilites are gone, cannot be combined with bless spell (could be too harsh) idk
Wizzards
Lower their passives dmg (earth, ice, fire, light), Make Life turnover take more HP from them (so its high rish high reward)
CHN
Give them 330 mastery so they get like 5% phy deff or whatever ability they want to upgrade
And yes maybe this nerfs are a bit shit but why not try them, tell ur GMs to make a 2nd server with 20 player limit, so certain ppl can try the nerfs/buffs in PVP