don't give up that easily
use the combo i suggested
sumons is the win for that fight
to stall em long enough before they get to your real units
and else just use a single stack of undead and use eviln
it's not as hard as it looks
i beated like 40 ancients ents
with 20 demonologist 13 royal thorns, 12 royal griffins, 15 inqi's and 12 evil beholders
but then again
i had descutrction on 2 and chaos on 2
and they were divided into 5 stacks which makes it all the more easy
but then again every summon in spawned got creamed in the first turn
luckily the burn effect took out 3-4 ancients ents every time ^^