Darth Caelum (Dark Synergy)

Darth Caelum, born Castor Kairos, was a who became  following the death of his Sith Master.

Behind the Scenes
Caster is an English name that means "from Roman Camp".

Caelum is a Latin word that means "sky, heaven", the Roman version of Ouranos (the Primordial God of the Heavens) is called Caelum.

Kairos is a God of Time and the younger brother of the Primordial God of Time: Chronos, Kairos is the God that represents Time as it happens, Kairos also means weather in both ancient and modern Greek.