Great Antosha
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For example, regular zombies are created from Zealots, and Plague Warriors are created from regular Swordsmen. The same applies to Cyclops: regular undead rise from Blood Cyclops, and Death Harbingers rise from regular Cyclops. This is clearly an oversight and should be changed.
Also, Golems and "divine" creatures (Unicorns, Angels, and Phoenixes) should not be converted into undead, either in the Transmuter or when joining, when the Necromancer has learned the "Herald of Death" ability. Currently, this is not the case for some reason.