Yes INT effects all charms damage or healing in both the main slot and Acc slot. It also increased your magic defense a little.
The only thing it doesnt do that adding points in yourself would, is increase your mana pool.
Edit - Same rules apply to the Acc charm tho, if you have INT on it, it wont count for anything
This post was edited by KakeWalk on Jun 25 2011 03:29pm