They're part of a druid epic 1.5 event.
Kill 3 or 4 Reborn and a Ritual Conduit despawns and turns into a Noc Juggernaught, kill the rest of the Reborn and the Noc Juggernaught to get energized noc blood for druid epic 1.5, and an uncommon chance at a chest with some loot (the loot reported so fa