Unknown alien species

According to the Daelaam archives, an unknown alien species was encountered on a protoss border world. It had strength enough to hunt protoss warriors, and was able to explode on death.

Praetor Fenix encountered one when negotiating the release of hostages. It separated his legion and hunted them like prey. Fenix managed to defeat the alien in martial combat, and survived its explosive suicide.

Trivia
The alien is likely a reference to the Predator from the Predator franchise of films.