There was something the Guardian of Obsidian Descent was unable to do against the Guardian of Scarlet Bond's proposal.
In a tradition where succubus' knights and their knights' fight against each other, once the proposal of life and death duel was raised, the other side must not reject.
It was the first agreement that was agreed upon by both sides when the tradition commenced. To begin with, the incubus' knight was unable to fight against the blood knights created by the first Demon King.
However, eventually, the incubus' knight gained the upper-hand as they adapted and after receiving the blessings of the Demon King.
Lately though, it was now reversed, after the Lady of Chains and Whisphered Vows' first appearance.
Now, another life and death duel was about to occur and the Guardian of Obsidian Descent must not reject it at all cost.
After all, the succubus could have a solid reason to reject it if they proposed a life and death duel next time.
