Magic Anomaly

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

Once slain, Anomalies explode into a large ball of raw magic, 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.

Locations

 * Winterhold during the quest "Containment".
 * At the ruptures during "Aftershock".

Loot
A filled Soul Gem of any size (Petty to Grand, including Black) can be found, which was once powering their existence in Skyrim.