These are myth creatures i considered for Persians, from weakest to strongest:
1 maran > shahmaran (snakelike / nagalike monsters)
2 karkadan > shadhavar (ram / unicorn-ish monsters)
3 fulad-zereh > div-e-sepid (steel armor skin demon)
4 hadhayosh > sarsaok (fire ox/bull)
5 manticore > scorpicore (already in use but hey)
6 azhdaha > azhi dahaka (hydra like monster)
7 huma > simurgh (mythic magic bird)
from left to right is from basic to upgraded version.
Let me know what you think