Clan Altar Exp

Individual and Clan altars placed in Red zones provide a 50% EXP buff each within 5km

Placing your altar near the clan altar (it moves a lot) will give you a massive EXP increase for lifeskills, which also affects your character's EXP

Only 1 altar effect works on Char exp and Weapon EXP from killing mobs/dungeons, so you only need 1 for those.