Nexxthar Grimaxe, after being visited by a mysterious Orc while sitting in Sun Rock Retreat, became inspired to begin the establishing of the Grimsong Clan to encourage the members of the Horde into action. The Grimsong Clan is a Horde Clan obviously, accepting Orcs, Trolls, Tauren and possibly Elves and Undead if they have a good reason, but not a large amount.
So join, for the Grimsong Clan and for the Horde!