I've tried using more magic and the end result had been... underwhelming so far.
Magic is also quite a reliable means of destroying opponents, although the weakness of casters compared to weapon users still annoys me. It also doesn't help that Spell Penetrative increases from Strength, not Willpower (!)...
In a fight with the imps, however, this is not too important, as the opponents they are far from the strongest, in my opinion, just very durable due to the fact that Imps Shankers have 300 health plus crit immunity (any character with a shield is crit immune).
I could give a couple of tips about playing a caster, but relatively recently I already gave advice on playing a black magician. My advice was not without errors (I'll have to fix them ... someday), but I seemed to give the basics quite decent and didn't make any fundamental mistakes (and I do not see what I could add about this).
That's why I'm shamelessly linking to my old comment and in addition I'm attaching a screenshot of the result of using the Crackle Powder + Arc Cannon tactic (plus Etheryn's Blessing before my attack).
Hey it been a long time since I last played and have no idea what I was doing with any of the characters I have so i'm thinking that starting over would be better for me. Does anyone have a good Black Mage build?
forum.fenoxo.com
The screenshot was made on version 0.4.18, but there haven't been any noticeable damage nerfs since then.
In the screenshot, I used Hexblade Cait (as a single-target damage dealer), but you can use any character with AoE attacks instead if you have particular problems with crowds. Oh yeah, if you're going to be using one of the fire allies you might want to swap out the Crackle Powder + Arc Cannon combo for the good old fashioned Grease + Fireball combo (although I wouldn't recommend this in Undermountain due to one particularly nasty roaming boss with fire resistance and vulnerability to storm).
P.S. There are some important boosts that players seem to usually forget about. I'm talking about things like maximizing the willpower of the whole group with a blessing from Sanders and the Well-Fed status effect doubling post-combat recovery from the Trail Ration item.
P.P.S. If you do not understand some things in my words or have questions about the tactics I use, you can always ask them in the PM.