Green Lantern #9 Variant Edition

On the medieval fantasy planet of Athmoora, Sir Hal of the Lantern-a.k.a. Hal Jordan-must do battle with the evil wizard Ah-Bah-Nazzur, scourge of the Four Kingdoms! What is Ah-Bah-Nazzur's secret? And what does it have to do with the looming extinction-level Multiversal threat that leaves countless dead super-beings in its wake?