RTF is a global modification that replaces all towns in the game.

If we think about it,
for example, Necromancers, who also have spirits and earth and water elements (they also have many swamps and decaying forests), would worship Ascha, or rather, her corrupted form.
This doesn't prevent the Lizardmen from also worshipping a corrupted form of Ascha or Shalassa – large, evil lizards (this brings to mind the chicken-dragon of the Dwarves).