When there's a Trex, there usually follows a Spinosaurus. Two apex predators zombified and resurrected by demonic forces. Observing the previous entry of the Necrosaurus I noticed that while the Trex was intimidating in appearance, there was room for more of a "demonic" title. I brainstormed ideas as I was certain that I wanted the Spinosaurus to carry the signature split jaw with glowing blood, I struck the idea of adding other living entities within it's own corpse. I remember from a scene in the movie Annihilation (2018) where a man's guts were sentient and moving like snakes and I thought it was a brilliant idea, except that in the Spino his guts were literally snakes.