Mannoroth's Bones Is the Horde Flagship sent to from Ratchet to Borean Tundra to bring the last of the Horde troops home after the War with the Lich King. Cairne Bloodhoof was aboard the ship to supervise the evacuation operations. At then end of the two days the supplies and veterans from Warsong Hold were mostly on Mannoroth's Bones, when a group of Kvaldir landed and attacked the Horde forces at Garrosh Landing. Thankfully between the leadership of Cairne and Garrosh they are able to get the injured to the damaged Mammoroth's Bones and then get out to sea.