I also agree with Hadouken, but for farming Chars its better too set all the Exp on 1 in Dungeons.
Mostly all Privat Server set the Boss Exp to 1, but if your farming about 2 hours you're mostly lvld up from 60 to +68 without a expboost, cuz u have to kill the other mobs for respawn. :c
So I would prefer a good Exp rate so everyone can also lvl without Mage, but less Exp in Dungeons. D: