Reminds me a lot of the Tyranid swarm from Warhammer 40k. Actually, if you've had the chance to play the newly released Hearthstone expansion, the Ancient One has a rather interesting quote: "The Doom of Worlds wakes once more!". The Ancient One and (probably) the Old Gods might be "outside the cycle" in the sense that the Void Lords can spawn them over and over again, similarly to how the Hive Mind spawns the Swarm Lord over and over in Warhammer.