I have been trying to figure that out since I playd in the beta.
Me and 2 friends tried to figure out if a staff hit harder by going magicka, or stamina.
So I had a templar with only points in magicka and a tad in health. When I had my staff on it showed the exact dmg number as the staff had by default. The same with regular weapons like swords and bows. One of my friends had only stamina and health, and hes showed exactly the same. One guy who had in both, shows the same results.
So basically, no matter what stat you took, it never actually showed up on the dmg/stat window. Other stats like max of something, seemed to work.
The abilities on the weapon themselves used stamina on regular weapons, and magicka on staves. But - what stat makes your default attacks hit harder? Because under stamina, it says that it makes "weapons" hit harder. All weapons it would seem, as nothing else was stated. Under Magicka, it did not mention weapon dmg at all, not even staff.
So the tests showed that no stat increased the base dmg for default attacks, even though it was stated that stamina would do so. I will assume it was a bug, and I reported it as such. But are we really sure that magicka affect the staff base dmg then?
Does anyone have any intel on this? The obvious would ofcource be that statt base dmg is increased by magicka, and the rest of the weapons by stamina.