I plan to have my main file be a paladin (60%mag/40%vit) with light magic (I haven’t picked a second yet magic but I’m stuck between fire, acid, water, and plasma). I’m not sure how I can make this work, does anyone have any suggestions?
pick whatever you like the most, synergies don’t matter that much and light only has like one synergy anyways
Bro is a paladin (which reduces damage) using light.
Do you deal any damage? 
whats your current stat build? if its a mage al you have to do is add vitality hen the next lvl increase is added. alternatively make a new file and have that be your paladin main.