I don't see the point in this, but it can be done if you really want to:D
You need to have:
1. Cursed Armor
2. Explosion
3. Protective Field
4. Sphere of the Sludge Lake
5. Expert in Wisdom, Intelligence, Tactics, Fire Magic, Earth Magic, preferably also Magic
6. 99 Strength and Knowledge. Just for fun, you can double the mana in the dungeon.
7. Hourglass to bring the morale of the Archangels down to zero.
8. Blindness
I don't think I forgot anything.

So, the armor at the beginning of the game will slow down the Archangels by 50%. That is, they won't reach you before turn 9, and the bird won't appear on them because of the hourglass.
By moving the Imps to the corner according to the tactics, we set up a protective field (it's a pity it doesn't last long, I'm not sure how long. You definitely need to know how long. It's easy to find out. We blind the Archangels and wait for the field to disappear). We set up the field again. We bombard the Archangels with an explosion dealing more than 11500 damage, waiting for the turn after which the field will disappear. In this turn, instead of the explosion, we blind the Archangels. Then we set up the disappeared field and keep attacking until the final victory.
Don't worry about the mana, 4000 will be more than enough.

As requested, I killed 1000 Archangels in an open field with one Imp. As it turns out, it's not the gods who make the pots;)
Those who want can test this option, but I'm out. It will take 45 turns just for the explosions. That's too long.
Too complicated? But is anything easy these days?