I think "The Pharaoh" is a better name than "The God King" personally
Very creative idea! Its range is definitely too large (that amounts to farther than 3 3x3 buildings!), but 3 tiles radius should be good. However, I'd rather have this available at TH11, if one ever comes out, because otherwise it would offset the idea of introducing a new hero every other TH (first at TH7, second at TH9, [third at TH11]). And honestly, TH10 has enough heroes for now. Out of the three special abilities, (2) the locust swarm would be the most ideal, since the previous heroes all summon entities upon activation.
The DE troop idea is cool as well, and as you said, it would fit the Pharaoh hero idea better. However, since we already have a Tesla targeting troop (the PEKKA) I'd recommend that it be the Inferno Tower. Corresponds to things "undead" such as h e l l. Then the Inferno Tower would focus on the spirit instead of the Tesla. Also, I recommend this being unlocked at TH10, since all DE troops are currently unlockable at TH9.
More details would be helpful as well.
Overall creative and well-thought ideas. Well done!