Isiah didn't hesitate not even for a second when he started to use that deadly spell.
Obviously, he didn't know what was the result of that spell on non dark creatures yet , he used it because he thought it would hurt every person that runs with divine energy .
He said in the Gowarian language "Nelrovin " and suddenly appeared his shadow dark energy was used to perform it .
Nelrovin was a very hard spell among those he learned at the Summit, summoning a dark rain was very hard when he was there, especially when he was next to the attraction of that sea.
And even when he was learning the spell and practicing it there in the world he couldn't master it, the spell was very different here and he could tell just by the flow of his shadow dark energy .
Back then he succeeded in doing it after a long time of trying, however, the problem was the perimeter .
The spell couldn't reach much space as he wanted .