How do you defeat the dark elves?

It's pretty much like every other multi-party battle.

As always, make sure that your pet's specs are allocated appropriately and they have the best matching equipment that you can afford (at this stage in the game, I'd expect it to be Legendary).

You need to take the riskiest opponent down first. Flute's guide here has some suggestions on the order in which you should take them down depending on whether they're Warlords, Assassins, etc.

Sometimes multiples of the same type of Elf will appear. Depending on which multiples you get, it may make the battle really difficult - if this just happens you might just need to take the loss and try again. Definitely don't let it stop you from trying though because it is possible to win those battles!

All that said, here are a few additional tips for the battle that I found quite useful:

1. Enter the battle with full health, full mana, no wait time on the Mend ability and a blessing or two from Aryth's Spire (30% mitigation and 30% damage are the best ones).

2. Three Finishing Blows should be delivered to the worst opponent (generally a Sorcerer) in the first round.

3. Have plenty of health potions on hand so you can heal every second round if you're taking a real battering (and use Mend once you drop below 75%).

4. Take down the opponents systematically from worst to least scary.

Good luck!

Thank you.