Well, it’s not a surprise that Kizashi is easy to manipulate. He is a brat, but sadly when a brat is out of control like he is, it becomes a problem.
To offer 10,000 deaths is Hitsugi and he is the reverser, Majik. Curious what his abilities reside in. Desscaras’s points on his trial being valid—it seems clear he could be so interested in it to bring misery on humans. Or could it really be he wishes he could have those emotions? At the very least it seems the little brother of Desscaras might be one of the 10,000 bodies she has to kill, perchance.
Also, it makes sense that the difficulty of a Majik trial depends on their hatred of humans. After all, if you hated humans, you would make sure you wouldn’t be easily captured.