There are quests, daily missions for rewards, and quite a lot more, indeeed the game is definitely one for people who like it complex.
You need to spend xp to master powers you want to keep.
The combat is very strategical and I'm only just getting into it myself, especially with the amount of things you can customise about your character.
Outside of combat, there is lots of item crafting, (pretty much all items in game need to be built), and even jobs which you can do with your none combat skills which are gamebook style choice based missions.
Please note Kava is a non-alcoholic beverage used traditionally in the Pacific Islands for ceremonial purposes.
Formed by the root of the pepper tree Kava usually has a mildly sedative and anaesthetic effect, although it is possible to have adverse reactions including upset stomach.