before the skilltree was splitted into each character you can maximize your skilltree quite easy (maybe), so when that was that, i'm trying to complete my skilltree and end up with ryen level 94 and the rest of the team level 85, anyway here's a tip if you want to level up easly end-game : 1) you need to be in dorgania (seaside tower) 2) you need the ring of wisdom and armor of wisdom. 3) fight the elite bandit in the seaside tower, and you can get easy 5000 exp per battle with the bandit there.
(Sorry for bad english)