i meant that if you start to put things together just by how evil it is, youll finally get 2 factions: the Good faction(knights, elves, wizards) and the Evil faction(necros, demons, warlocks, barbars). now with 2 factions it would be boring.
and why are inferno and necro so different? (now about fantasy only, because in real mythology all factions would be completely mixed up anyway) their anatomy and colour, and other such attributes. undead have bones, decayed flesh and transparent stuff, demons usually have horns and red or orange skin, bat wings etc.
you could also say orcs are entirely death-aligned. Tolkien took the word "orc" probably from Orcus, which is about Hades in roman(so Tolkien meant orcs as demons, and in LotR they arent exactly the wild nomad nation they are in wc3). so maybe orc should have been in h4 infenopolis too? but nay, in todays fantasy orcs, undead and demon have become nicely distinct themes with different attributes and i dont see anything wrong with it, as each is quite unique.
about Gaudolth, i meant that you quoted also "fantasy and horror fiction", under which Gaudolth certainly belongs.