Discussion about Dungeon (Dark Elves).

It's definitely a good idea to use vampirism on the female units, but I prefer to take ranged units when the game drags on for 2 months. Otherwise, they can be easily defeated without much trouble.

Hmm... Actually, they are in stealth mode during active trading of stacks. And whether the Warlock bets on Chaos or Summoning, besides Darkness, doesn't matter. If he bets on Chaos, then a couple of Shocks will significantly thin out the enemy ranks in addition to the attacks of Furies, Riders, and Dragons. If he bets on Summoning, then the Phoenix is already causing havoc. And the Mistresses are calmly casting spells on their own or enemy units at this time. Or they sneak up for an unexpected attack.
Yes, the Mistresses are also a good unit, but I would only use them with Erin for ranged support of the casters. And besides, creeps work better with the Mistresses, and upgrading them is not a cheap pleasure.