psatkha
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in the game, there is a file in GameMechanics\RPGStats, it's called DefaultStats.xdb, if I'm not mistaken. If you browse through it, you'll find the names of living creatures, and below them, their undead counterparts. I replaced all the regular vampires with improved ones, and I added the regular ones for Ents.
Yeah, that's exactly how it works!
Best regards, Psatkha