A venerable relic from an ancient time
Muse is both a common term for a handheld Cognet linking device, and also a specific brand of said CogLink device. Functionally the Cosmic Era version of a smartphone
Salvation to oneself is bought through the salvation of others…
A staff of great power in the hands off those who manipulate the strands of fate.
A demon who isn't some hideous creature bent on consuming souls, bu is, in fact, a likable chap who enjoys having pleasant chats with people - trying to talk them into becoming his servants.