jimtillman
Explorer
this is a neat idea going to have to play with it
Sounds like fun. Mechanically drow is probably weaker than human with polearm mastery (it's a huge feat, up there with GWM).
As far as spells, I find that by Warlock 5/Barb1 I'm mostly casting Armor of Aghathys and fireball. Really not much of anything else other than darkness on rare (rare) occasion. Darkness just messes with the rest of the party so much it becomes "unfun".
It might not be super fluffy, but I like this build with Half Orc plus Darkness and Devil's sight for advantage and crit fishing. Darkness is a little niche based on the party, but it's useful in enough spots that I'd build around it. It does make a nice secondary option for when you can't rage. I might tend toward a more balanced level advancement too, even if that delays some of the sexy Warlock invocations.
What arer people thinking for Barbarian path if they take it to 3rd? I like the Bear Totem, but Zealot also has some appeal.
Your build probably shades more to mostly Warlock with just a hint of Barbarian around the edges. The Wolf totem isn't bad either for a more maneuver-y character. I might be tempted more by a level or two of rogue for you guy than more Barbarian. That package stacks up pretty well.