Necromancer

You can't put up with this asshole anymore. You had to put up with him as a kid and as a teenager and even when you went away to college! Well no more! You're a lot more powerful and you're going to finally teach the old man a lesson.

You unleash a death cloud upon your Dad and his company, most of them fall to their knees choking up blood before dying. Your Dad is made of a little stronger stuff and charges at you, but you blast him with a bolt of negative energy. He falls, struggling to breathe.

"(Wheeze) Hope yer happy boy…you killed an old man, with some sissy magic tricks…ha ha…Mr. Big Fancy Nec…"
"SHUT UP AND DIE!" you shout and cause his flesh to age at an accelerated rate and rot. You don't stop until his skull becomes dust.

You sit down beside the dust in exasperation. You allowed him to "get" to you. You didn't want that to happen. Especially since you wanted his help to get to Velzix. Still you may be able to probe the minds of his dead soldiers and still go through with your plan of killing Velzix yourself.

Or you could decide that doing this alone would be suicide and go back to Aftermath.