Originally posted by Cogito
No, they'd reform. The only two ways I recall black lanterns being defeated were emotional spectrum light and Mogo's core, where they'd be crushed by gravity and constantly incinerated in his molten core goodness.
Sounds like plausible options would be to beat back the Black Lantern Corps into a black hole, sun, or the Crunch. The great thing about the A-Wave is they had Thanos' teleportation tech that allowed them to move entire space armadas. Don't remember the BL Corps being able to teleport. Nekron is puzzle though as to whether or not the Crunch can handle him. The A-Wave also has a reality warper on their side to assist Tenebrous and Aegis in sealing Nekron away in the Crunch.