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To complete this mission, you need to visit all the obelisks (some are located in dead ends in the dungeon), the Grail is also in the dungeon, and bring the Grail to the ritual site. Then a demon will appear; you can go back to your castle and recruit an army to kill it, but the demon doesn't move. Next, you need to play as the Angels. First, it's best to capture the demon city in the north; this is easy even with the starting army. Then, go south, and you will be given a city. You can take the army from the gate and build and upgrade all the creatures in the castle (there are plenty of money and resources). Then it will be easy to kill everyone. (It's better to fight with Frida, and the Grail still helps).