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Okay, you've convinced me – Heroes of Might and Magic, part of the Might and Magic universe. I just wanted to focus on Heroes as much as possible.
Regarding the summoning, let's use a little imagination! If we buy an angel in the game, it doesn't necessarily mean we're literally buying it – it means we:
1. Pray, asking, say, a god to grant us good fortune.
2. Offer sacrifices or burn incense.
3. The god sees, hears, feels compassion, and sends an envoy.
Instead of a god, it could be a devil (arriving himself) or a demon (sent by the devil), and so on.
Think of it metaphorically (or symbolically?).
