Heroist
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That's where they got it from, because Ubisoft stated it themselves, which is why there are no familiar gray, mercury, gems, and crystals in the seventh installment, because in this universe, according to the canon, they don't exist at all, and more than half of the fifth installment is not canon, as they later stated. So, let's stop comparing everything to the third and fifth games.
Thank you. I understand.
Added 2 minutes later
Actually, that's exactly what the demon's attack meant. Kha-Beleth needed Isabel to give birth to Sareth. He probably chose her because he wanted to avoid a scenario where a too smart and cunning offspring would usurp power.
Whatever