He's got a huge connection to a Drow god known for his superiority complex (wis 20 total). Pretty sure that keys into everything you ever wanted to know about Keijen Blade.

[Plus all that stuff he didn't want to hear from the people who also got visited by Blade the night before Vi's wedding.] Whatever the ultimate endgame is, he's getting something big out of it. Him and all the little Tiefling pop stars working with the Church