The horde has new quests in 5.1 related to Vol'jin, A Dagger in the Dark. Here are some screenshots. Vol'jin is ordered by the Horde to investigate the origins of the Saurok. He is not happy to discover that the Mogu created them out of dark magic, but Garrosh's loyal guards are excited by this discovery - they want to create an army of corrupt warriors, similar to the Mogu.
Screenshots
Summary
Stage 1 - The Mission ...
Speak with Vol'jin to begin the search in Saurok's Cave. Starting at the tavern in the mist, you'll make your way up the hill
Stage 2 - We ride!
Find the entrance to Saurok's cave. Vol'jin expresses relief that you will help him, as he doesn't like the way Garrosh's guards look.
Stage 3 - Guards!
Defeat the Saurok that guards the cave. Vol'jin will help you with totems and traps that stun the Saurok.
Stage 4 - Inside the Cave
Go into the cave. A member of your party will jump into the Horde boat to fire explosives at the Saurok. The other members will have to kill him normally on the banks.
Stage 5 - The Source
Find the source of the Saurok. As you make your way to the cave for the Lineage Master, you will get an item that allows you to destroy various pieces of eggs.
Stage 6 - The Lineage Master
Defeat Lineage Master Noshi. Destroying the eggs is very useful here, as the Lineage Master will take them out of the egg when they are low on health, which can cause everyone in your party to be killed. Vol'jin arrives next and casts an immunity shield so your party doesn't take damage while you take down the Lineage Master.
Stage 7 - Investigation
Investigate the Mogu Statues. Rak'gor meets with Vol'jin to declare that Garrosh is interested in the Saurok, as they are tied to the mighty Mogu. Vol'jin later learns that the Saurok were not born in their current state - they were turned into such creatures by the Mogu's dark magic. While he is not happy about this, Garrosh's guards are very keen on pursuing this investigation.
Final Stage - Ambush!
Kill the Kor'kron ambush. When Vol'jin exclaims, “Garrosh plays God? Creating monsters? This is not what the Horde is about! Garrosh's guards stab him in the neck. Vol'jin does not die, but is seriously injured. Your group must kill the rest of Garrosh's group.
Achievements
You Mean That Wasn't a Void Zone?: Destroy all remaining eggs before the Lineage Master reaches 20% health in the Dagger in the Dark quest.
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Watery graveKill 3 of the Darkhatched Lizard-Lord's reinforcements using his water propellant ability in the Dagger in the Dark quest.
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You Mean That Wasn't a Void Zone?: Defeat Rak'gor without any member of your party standing on the healing totem in the Dagger in the Dark quest.
