They are invading Warsong Hold through the quarry within the stronghold. Unwilling to let them take down Warsong Hold's defenses Overlord Razgor sent Horde forces on the offensive against them.[1] They've taken to storing their eggs scaffolding surrounding the Warsong Hold in order keep them away from the epicenter of conflict.[2] Seeking to stop the attack on Warsong Hold Quartermaster Holgoth sought to destroy the sinkholes that the Nerub'ar used as tunnels and passages within the quarry.[3] The Nerub'ar forces attacking Warsong Hold ultimately retreated before the dedicated efforts of the Horde.[4]
Nerub'ar found within the southern Geyser Fields come under attack by the Horde.[5]