Thalakos

Thalakos is a blue creature type used for cards that depict an insane Spirit-like race of beings trapped in the Shadows of Rath. All have the keyword ability Shadow. The cards as they appeared in the Tempest block didn't have the subtype Thalakos. It was later realised that a non-human race should have its own subtype, which was fixed in the Grand Creature Type Update.

Storyline
The Thalakos originally lived on Dominaria, maybe with another outward appearance. During the time of their planeshift, the Thalakos were entrapped in the conflict between the Dauthi and the Soltari, despite their neutrality. All three races were caught in the maelstrom of energy that surrounded Rath, and trapped within the "Shadows," the extraplanar space between Rath and Dominaria. They were left in an incorporeal state, unable to communicate with people on either plane, yet able to see into both the Dominarian reality and that of Rath. This predicament led the Thalakos to lose their sanity.