Custom battle:
6 Eldar Archers, 4 Eldar Swordsmen, 1 Eldar Lancers (general)
VS
1 Heavy Goblin Inf (general), 1 unit of Balrogs, the rest (until money run out) was Goblin Infantry.
First impression: Those Balrogs are ugly as hell. Their faces need reworking ASAP.
Outcome: I won with my general alive and 3 Eldar Archer units left almost fully intact. The rest got slaughtered - while the units of Swordsmen had a very good kill-death ratio, the unit that took the Balrogs head-on sustained full casualties and inflicted on 6 causalities (on stray Goblins!). Balrogs are just like Trolls, but worse. They will start going down, but they need time to do it