90 pve so kind of hard to be pure hexer? Oh and the weapon I'd probably use is roaring halberd for the dark scale (and I like halberds)

Well I wouldn't exactly go pure hex. Check out the soft cap levels for both INT and Faith and scale it from there. I've never tried the roaring halbert, but then again I'm not a huge fan of halberts anyways, I usually make a hex/dex build with a katana. But as for your level, this is my suggestion, make a STR build and use that until you complete the entire game plus the three DLCs. After all of that, you should be in the 180+ level range and then I would use a soul vessel to reallot your points. If you've found all of the soul vessels in the game, you should have like 8 or more by the time you're done, which is plenty to play around with and find how you want to build your character.