Utterly Mad

A nail bomb effect sounds cool. I knew about the maultaur gas bomb stuff. It's about the only way to kill them easily without the wraithverge, but if they start blocking while under the gas then it becomes impossible to exploit their stunlock.

I'd go for the warzone type map. It makes me think of the fortress assault level in brutal doom: hell on earth. Work your way up a series of canyons along with a large group of NPC marines to assault and breach a hell fort. It even had tanks bombarding the fortress walls. Tons of enemies, lots of projectile dodging. Guts by the gallon. Listen to some Saboton while playing that level.