Regvard
Arcane
I'm pretty sure dodge also counts towards dodging magical attacks, unless it's an AOE.
According to the stat tooltips willpower is what lets you dodge magic and dodge only works on physical attacks.
I did a test with this using the module "make a high level character and test it".
First I made one with willpower 11 and doge 1. I let a mage hit me 15 with a directed spell, that I do not think was powerbolt, as the effect was akin to flamethrower he also made an invocation before throwing it, but then again he threw it every round, so either the computer cheats or he was throwing another spell, or possibly not a spell at all. Thus I'm not 100% sure about this, but the results were as follow:
With willpower 11 and dodge 1, I only dodged a single one of the 15 attacks.
with willpower 1 and dodge 9, I dodged 13 out of 15.
Now this could be a coincidence, the chances of getting hit probabilistic, but by the same token; The chances of this being a coincidence is extremely low, probably beneath 5%. But again, I'm not 100% sure that the attack counts as a spell, or as a physical attack, as the powerbolt that the mage has, seemingly does.
There is a "weapon" section at the magic shop where you buy some magical attack. I wasn't a mage myself but used an npc and I think those work like a pistol you don't need to reload or something. Just some magical attack, not exactly a spell. You may be dodging those and resisting actual spells.