So what spells can he use? The way you made it sound he can only use the four Umbra Linguam spells, but he's also using levitation.

5084852 not really. He just said his first attempt at magic ended up being
Shadow magic.

It either blueblood or an outside faction.

I would say that the thing between ditzy and blood is goin a bit fast but I gotta admit thier interaction with each other is downright heartmelting

I feel bad saying this but I feel like your portrayal or the main character is really inconsistent. If blood moon is supose to be a 10,000 year old shadow magic user who feels no remorse over his kills he really shouldnt be acting so emotional and telling a random pony about all his powers.