I admit – I messed up with the terminology, and regarding the deaths, you mentioned that Necropolis units are constantly being killed but still remain strong, which seems a bit excessive in this mod, although it's still tolerable (I don't see any major cheating). However, the increase in their power is definitely noticeable, and the Sylvan faction expected some kind of balance.
In what way is it too strong? Did the deaths become more powerful than the Champions of the Dungeon (top-tier unit)?