fktifzobr
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Well, the history of Russia doesn't quite fit into that theory – your theory involves the spirit of a djinn and a demon, but in the history of Russia, the spirit of a djinn was absorbed by a mage, not a demon.
In general, if we don't deviate from the lore, we can do it like this: let the description that the developers made remain for the regular ifrit, and describe the upgraded and alternate versions in this style:
“Unit Name” – these are ifrits that (describe what happened to them – they leveled up/were influenced, etc.)
Added 3 minutes ago
that is, we don't specify anything and don't provide excessive information, we don't go against the lore, but rather complement it with something that doesn't contradict it (at least, it doesn't contradict what is known)
Added 9 minutes ago
here is some more information from the wiki
http://ru.mightandmagic.wikia.com/wiki/Джинны_(Асхан)
there is also information about ifrits at the end.
This description option is the simplest; I will most likely do it this way
Again, as little as possible about ifrits: D, developers