WoW Horde Factions

Horde Factions
The Horde is composed of Ogrimmar, Darkspear Trolls, Undercity, and Thunder Bluff. No mobs raise Reputation for any of the Horde Factions. The only way to raise Reputation is by completing quests.

Ogrimmar:
Ogrimmar is capital of the Orcs, located in Northern Durator.
RRQs that raise Ogrimmar Reputation are:
         Chen's Empty Keg
Known Faction related bonuses:
         At Honored you receive a 10% decrease on vendor purchases.
         At Exalted you can purchase a wolf mount, and learn Wolf Riding

Darkspear Trolls:
The Darkspear Trolls are outcasts from other Trolls, so have allied themselves with the Horde.
Known Faction related bonuses:
         At Honored you receive a 10% decrease on vendor purchases.
         At Exalted you can purchase a raptor mount, and learn Raptor Riding

Undercity:
Undead Forsaken players have lower-than-normal starting reputation with their team's Troll, Tauren, and Orc factions. Undercity is located underneath the ruins of Lorderan.
Known Faction related bonuses:
         At Honored you receive a 10% decrease on vendor purchases.
         At Exalted you can purchase a horse mount, and learn Horse Riding

Thunder Bluff:
Thunder Bluff is the capital of the Tauren.
RRQs that raise Thunder Bluff Reputation are:
         Morrowgrain to Thunderbluff
Known Faction related bonuses:
         At Honored you receive a 10% decrease on vendor purchases.
         At Exalted you can purchase a Kodo mount, and learn Kodo Riding
         Taurens are too big to ride any mount but a Kodo or Baren Rivendare's Mount.