"Crowley," Claudius exclaims with shock and delight and all the same improbable fondness. "Thou art a trove of stories for him, Lan Wangji. Thou see'st why I made him my confidante. He has a mind unlike anyone else's. I've sometimes had to correct his misapprehensions," which makes Claudius feel useful, "but he's also had to correct one or two of mine¹. Even when he has no counsel for me -- and he rarely does, he's a demon who doesn't tempt so much as encourage mortals on whatever path they're keenest to take -- he has a perspective I haven't. And his encouragement's always sorely needed, feelingly given. He has a compassionate nature, which it flusters him to hear." Smirking, he says, "But really. Armageddon would come again before you and Master Wei Wuxian divorced. I haven't the slightest how he got there."

It doesn't need saying, perhaps, but Claudius also values Lan Wangji for his perspective. His perspective on another friend is a double gift, and a deeply amusing one.

¹ Damien, obviously, the 'or two' was King Hamlet being in the mansion, which is a misapprehension Crowley influenced.