Added 1 minute ago
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Vampirism can only be learned in the pyramid near the city of mages, and the spell can be learned without the Dark Magic skill.

Oh, interesting spoiler. And how does the power of this spell compare (how much will it drain)? Can it be compared to spell power, Dark Mastery, or something else? What's the math behind it? In other words, is it worth investing in Dark Magic to enhance it? Because I'm always leveling up Twilight, with red griffins + readiness + vampirism.

I noticed that when performing the ritual to banish demons from a peasant hut, it doesn't always deduct 5 crystals. I've seen it deduct them, and then not deduct them if I replay. I thought it was glitching, but I checked.