I could extract the inscription from the lod model's cloak and apply it to a regular model, but I won't do that work just for one of four elements (I tried to make a ruby for the sword, but since I have zero knowledge of 3D modeling, I couldn't do it).
I doubt they just sloppily drew it on the texture; it's volumetric on the vampire princes.
Well, as an option, you could borrow it!

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1