Mini-Lexicon:

Infernith: Race of hybrids, half-humans — half-demons. They were born from rape perpetrated during the opening of an interdimensional breach with the Infernal Dimension. There are various types of inferniths including chimeras, which can create illusions and change their appearance, muses, vampires, sphinxes...

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Geminis: Geminis are couples of wizards living in symbiosis from their 19th birthday.

They can feel the pain of "their half" if it is hurt. They are bound until death — if one of the two geminis forming the pair dies… the other will die too.