As for spells, full AW Line and full BM line goes without saying. Then you want all those useful sustained spells, rock armor, arcane shield, miasma(good to have but not a priority).
After that, the crusing prison line is good, 2 spells are good in this line, kinetic weapon buff and crushing prison.
Another line is good is Mana clash line. It's not because of spellmight. Spellmight is more trouble than worth for Arcane warrior, cause when it's combined with shimmering shield, it deplets your mana faster than you can run, and when mana goes to 0 it deactivates automatically. You get this line for one spell only, mana clash. why? There are only really 2 types of mob that can threaten an arcane warrior, templars and mages. templars are so few in the game, 90% time it's mages. And mana clash can basically insta kill any mage and it's an AOE insta kill to, way too powerful to pass up.
The rest all depends on your preference:
The way I see it there are mainly 2 ways to go,
1. you consider yourself fighter first, mage second
2. you consider yourself mage first, fighter second
The first way, bump dex to 30ish, bump willpower to just enough for all sustained that would be high teen or low 20ish. the rest put in magic, you can spare a bit into con is you still want do some occasional casting in blood mode. you mainly just gonna activate combat magic and slash away with a sword. super boring.
The other way, I would forget about dex, nothing in it. still only pump will to high teens. get con to around 30-40, rest in magic. just one word of caution, before you get to lvl 20+, make sure to cast non blood line spell when combat magic is off. else you gonna kill yourself pretty quickly. After lvl 20 when you have 40+ con, well, you got enough hp to cast whatever and in whatever mode. The rest of the spells are just personal preference. you have the respecc mod, they whatever combo to your like
Some worthless spells, death magic, totally uterly worthless escpecially in blood mode. it heals 1hp per corpse.