Thessala

Thessala is a world known chiefly as the site of the Battle of Thessala, fought in orbit above it in 121.M31 during the Great Scouring. No fuller geography of the world is recorded.

The battle was an ambush by the Emperor’s Children, under the daemon primarch Fulgrim, against the Ultramarines fleet of Roboute Guilliman.

Fulgrim stabbed Guilliman in the neck, and Guilliman was placed in a stasis field.