Not sure about that one actually

I mostly just use hammer vs those and play mage with 15k hammer 8k foh

Hi, I did a test yesterday and I bought the Magic Sunder with +11 magic skill damage and guess what, it does not increase the foh bolts damage

Hmmm weird af
I did also bought a magic jewel for my foh but didnt had time to play much with him since :/

The -% shouldnt be seen in stats damage but should still increase the dps
That would be weird af if it works for hammer but not for holy bolt