A Warrior hero from the Dungeon faction? That's absurd...

but the point is that somewhere, the excess skill points need to be spent, and that's why summoning is chosen. and it's impossible to create a pure warrior.
"teleport assault" is perhaps the only thing that allows you to effectively use hydras/minotaurs, but this will require the hero to cast it, instead of a creature. a good choice for a warrior who doesn't level up magic at all.

but is such an unusual build better? at the very least, it doesn't contribute to quickly clearing neutral creatures..
unless you can use it on an orc, who will level up a chaotic skill, and the warlock won't be able to take chaos skills.