Awakening of Evil

Company. Part one. I reached the Archangels, they give a quest, but it's not clear what exactly needs to be done. I've searched all available locations – nothing.

The Archangels offer the hero to pass if he pays tribute. A window opens with 4 options:
1) Give them 50 crystals
2) Sacrifice 25% of the army
3) Sacrifice a dragon artifact
4) Fight the Archangels

You need to choose the option that suits you, and if everything is okay, the quest will be completed.

If this window does not appear, then most likely you have a game version lower than 3.1.