The end of every existence. Every being in existence has to meet their end at one point. Whether living or not, whether mortal or not. Every entity at one point, reaches the conclusion of their life.
Zulcriz was that end. He was the inevitable end of every being and pouring that concept as a Spell, Richard was about to launch it at Ithryx.
The Abyssal Verdict, which can cause the ultimate demise of the Demon General.
Ithryx had no idea that Zulcriz had given the brat control over that spell as well. As such, when the strongest General realized what he was getting targeted with, he surrendered.
"You are seriously giving up now?" Richard asked as he got back on the surface and released his hold from the spell.
Ithryx, still on the ground, nodded,
[I protect my dignity, but do not make foolish decisions to uphold it.]
Richard was aware of what that spell could have done, that's why he could understand Ithryx's stance.