Thanks to Illwinter for taking the time to make this a mod rather than just waiting for Dom III.
I'm not sure it would be really be overpowered vs. Ry'leh... it is like saying Vanhiem is no good because using fire blessed vans you could overrun nations like Mictlan, T'ien Chi, or Ulm in the early game.
A few typos I think, the Mermidon description says he can't leave the water, but he is amphibious. Also, the Triton King mentions summoning hippocampuses, is this dominion/scale related?
EDIT: Didn't notice the Siren's air magic above water
