Magic Anomaly

is a creature found, and tied to events resulting from the Eye of Magnus. Fast, Agile creatures, they are highly resistant to magic, and difficult to hit.

Once slain, explode into a large ball of raw magic, but dealing no damage to surrounding creatures. Their final bodies appear as fine blue dust on the ground, or in the air where they were last floating. A filled soul gem of any size (Petty to Black) can be found, which was once powering their existence in Skyrim.