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I really enjoy playing with Nimues: gating is awesome. You can create a "Babylonian confusion" on the battlefield.
Before the battle, divide the Cave Lords into two stacks (x2). All troops open the gates, including the Cave Lords (x2) and Archdevils. The devils that were given at the beginning of the battle, and those that came through the gates, summon more Cave Lords (x2) from the corpses that have appeared by that time. The summoned lords open the gates again (x4)... And now, children, let's calculate - how many Cave Lords are on the battlefield, and is it even possible to maneuver on this battlefield? :D