"A torment of rain washed over the city."
I think you mean "torrent"?

"Even in on the cold, on wet brick..."
This sounds like something you edited later but forgot to completely clean up (I do that all the time haha)

"My connection to it is strong and it’s closeby."
*close by

This is more general, but I noticed you describe the Onyx Tide making "its own version of a laugh" a lot. I don't think you ever describe what that actually sounds like? You could make it seem creepier that way.

"Too bad you are just like the rest of the vermits on this planet..."
*vermin?

"The attacker was thrown free. Nails tore into the pavement. Donsin landed face first in a puddle."
well considering how Kenneth died that is not a good omen

"Puddles exploded crashed up behind Lyous as he bounded forward."
exploded crashed

"The flesh was rubbery and thick, flecting the strike."
*deflecting

"Lightning lit up the night sky, grabbing Lyous’ attention. The demon turned to face the sky."
sky x2

"Donsin’s head spun, he could barely think straight."
Comma splice

"Cold water rushed into his mouth, chilling him to his core heart."
core heart

"The pool of acid waded inside."
*waited?