MANTIKOra
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I think such a system would work:
1. Archangels are controlled by the computer.
2. The demon somehow appears earlier.
3. Cursed armor (slows, causes misfortune...).
4. A huge mana reserve.
Then, perform the following actions:
1. Hypnotize.
2. Summon elementals.
3. Hide the demon.
4. Attack them with an explosion or chain lightning (if there are many groups of archangels).
BUT YOU NEED A HUGE MANA RESERVE.
Although, there's another option: if you have the Armageddon's Blade and the archangels are separated into seven groups, summon elementals and Armageddons.
It's possible to win; will hypnosis work on them? You need to summon elementals and hide the demon!
Added 2 minutes later
And if you summon Armageddon, the demon will die.
Added 2 minutes later
Summon a bunch of elementals, and if you have enough mana, you can cast Inferno or Meteor Shower.
