There's a mission in Striga (I think) that's filled with Mech Men which is a blast since robots don't run from burn.
They ALL float down here. When you're down here with us, you'll float too!
@Starflier
I've got an arc that's nearly all robots (the types of robots vary based on mission level) that may do what you're looking for. The dialog is somewhat groan-worthy, so be warned. 
The title is "Rock 'em Sock 'em!" and the ID is 204003.
rofl
Hey all,
Back after a near 8 month hiatus, and am trying out the new Mission Architect system. I was thinking that it would be the perfect opportunity to make my 50 fire/fire feel like a beast, instead of the squishy underpowered scranker that he is. I was thinking of filling it with terror resistant mobs to maximize burn again.
Are there any mission arcs that you've tried that make your fire/fire- or any other tank for that matter- feel like an absolute monster?