I think the main thing is to kill the archers and druids at the beginning so they don't overwhelm the Gatekeepers. Then, you need to summon drakes or trees, preferably trees, to confuse the drakes and unicorns. After that, quickly summon more units, and it should work out fine. You can use Chaos magic on the druids and archers to quickly eliminate them. Meteor Shower + Boots + some artifacts that boost spell power. And you can level up spell power in one way, but I won't reveal how (it's a trade secret). You can also use Darkness magic, of course. For example, Berserk on the trees – if the archers and druids are behind them, it's game over for them. However, dealing with the drakes under Elven Luck is a challenge. You'll have to take Summoning Mastery to summon quickly. A staff isn't bad, but why the rest of the junk from the set? I don't think removing Spirit is necessary here. Also, don't remove Luck. I don't think Nibros is necessary because the drakes will reach them anyway, unless it's for the unicorns, but I think Nimue is better in that case because we need more summoning points to kill more of those lucky elves at once.