As Reign released the myriad of souls he had captured from his consciousness, he gave them a command, only one command – attack.
No tactics, no turning the souls into weapons, nothing except for the release and command. That way, he would be able to command more souls and could do whatever he wanted after giving the command as they would follow it without him having to give them another one.
He was planning on overwhelming the Warden's Soul Power with the souls he had devoured over time, hoping it would be enough to break through, or at least weaken the oppressive aura the Warden had. He had never faced something like that before, nor had he ever done anything similar to this before, but it was the only thing he could think of right now.