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

maybe give Rakshasas to elementals at level six? There are no elementals of thought and magic on Ashan.

What don't you like about Djinns? I once wrote that level seven creatures could correspond to elementals of seven types of magic (water, fire, earth, air, light, darkness, primal). Djinns and Simurghs would fit the primal type (given the origin of the Simurgh, this is logical).