Although Duanmu Huai firmly refused Liliath's invitation, to say there's no regret...
"Ah, what a bother. What if that really was part of the main quest?"
Walking down the deserted hallway, Duanmu Huai held a flashlight, inspecting his surroundings while muttering to himself. Even though he defeated the Fallen Angel, Duanmu Huai still couldn't summon Mary and the others, nor could he use chess pieces to transform them into his God's Favor.
But he was a Judge, no way he would actually work for the Demon Clan, let alone Liliath wanting to convert him into a member of the Demon Clan. That's totally out of the question.
Whether she could succeed was one thing; whether or not Duanmu Huai was willing was another.
The so-called Alien Tribunal full of Aliens, the Heretic Tribunal full of Heretics, and the Demon Tribunal full of Demons is quite a famous joke...
