Angeror wanted to become the guardian of the nebula, but his friend Glator was voted to rule it instead of him. Glator had placed Angeror in his will, so Angeror killed him on Lunica. Angeror has since owned the nebula. (Before the Storm: The Creator's Curse)
The name of this location is a pun, as JAGEX are the creators of RuneScape (the game).