[asmutny]

well, I'm level 45 now and never been in danger of losing that fight. gremlins' HP varies from fight to fight and stacks of monsters can be randomly numerous. it really is a tough fight sometimes, but now it's always a no loss for me. It seems you need a proper kind of hero and army. Soothsayer has the biggest advantage, imo, thanks to his large mana pool, ability to replenish it during battle, offensive spells (blizzard, geyser, fireball), his soothsayer ability lets him cast six times 2 spells in a round, with artefacts adding to the spell effectivenes he can deal huge damage to the enemy. mixing combat spells with some auxiliary ones, like fear, slow, magic shackles, even sheep or pygmy, you can wipe them out quite easily. your army is also important. I have 6 black dragons and 7 ice dragons, both magic resistant, nice initiative, long distance flyers. Ice dragons have 'create minions' ability, great stuff, serves as a tank on battlefield. after killing off an enemy the ice dragon can reuse this ability to replenish the number of minions to original state or recast a new one if the previous one is dead. I wouldn't be surprised to see stronger gremlins and more numerous monsters as I'm leveling up, but the gremlins never attack my dragons, unless being attacked themselves and the damage they deal is ridiculously low. rage skills (christas gold, ice wall, lava golem) serve as a distraction to the enemy, the dragons can simply ran away from enemy to the opposite end of the battlefield, and when mana is low, even spells like flaming arrow or magic missile deal 2k damage for the price of 5 mana only.
but I agree that for other classes it may be much more difficult.
a pity that armageddon deals damage to dragons too, this spell would be a massacrating tool to quickly finish the battle.