Den of Wolves

Durotan wishes for us to join him now that you have undergone the ritual.

What ritual? The flavor text apparently refers to the ritual in Honor Has Its Rewards, which Wowhead currently lists as the prerequisite. Unfortunately, in the game, this quest comes first. It takes you to Wor'gol, where you will pick up Honor Has Its Rewards and perform the ritual. Someone at Blizzard may have changed things (during beta?) or got a bit confused, apparently.

FWIW, Wowpedia lists the quests the way they actually are in the game now.

If you boosted a character to level 100.. Go to Wor'gol. Farseer Drek'Thar will not be anywhere, near or around your garrison. Just save yourself the aggravation.

Video Guide: https://www.youtube.com/watch?v=mlbeyFkjqgU

1. Den of Wolves - (Video)
• Accept Den of Wolves from Farseer Drek'Thar, in your garrison, at coords 49.4, 50.0.
• Travel to 47.0, 49.4 and click the [npc=78320] to ride it to Wor'gol.
• After landing, follow [npc=74808] and Farseer Drek'Thar to [npc=70860], at coords 20.8, 57.9, and turn in the quest.

2. Honor Has Its Rewards - (Video)
• Accept the quests Rally the Frostwolves from [npc=70860], and Honor Has Its Rewards from Farseer Drek'Thar.
• Travel northeast to coords 17.6, 56.6, click on the [object=226468], and select "Spirit of the Wolf"
• Turn the quest in to [npc=80456], near the [object=226468].

Rally the Frostwolves
• Travel west to coords 19.2, 60.0 and click on Farseer Drek'Thar.
• Travel northeast to coords 20.8, 58.0 and turn in the quest to [npc=76557].

3. Gormaul Tower - (Video)
• Accept the quest, Gormaul Tower, from [npc=76557].
• Follow [npc=76242] and [npc=76240] to coords 21.2, 44.2.
• Fight alongside [npc=76242] and [npc=76240].
• Turn the quest in to [npc=76240].

4. These Colors Don't Run - (Video)
• Accept These Colors Don't Run, from [npc=76240].
• Travel northeast, in the same direction as [npc=76242] and [npc=74273].
• While traveling toward coords 30.9, 25.3, kill 8 [npc=73759], and use the [item=107279] on their corpses.
• Enter the building at coords 30.9, 25.3.
• Turn the quest in to [npc=74273] at 27.0, 33.8.

5. Deeds Left Undone - (Video)
• Accept Deeds Left Undone from [npc=74273] at coords 27.0, 33.8.
• Pick up 5 [item=107361], in the same building, while you travel toward coords 28.6, 36.2.
• Enter the chamber at 52.9, 49.7 and click on [npc=75167].
• Exit the chamber and follow [npc=75167], outside the building to coords 34.1, 72.6, where you will turn in this quest to [npc=75177].

6. Great Balls of Fire! - (Video)
• Accept Great Balls of Fire! from [npc=75177] at coords 34.1, 72.6.
• Travel up the ramp, avoiding the fire balls (of course!), toward a small building at 66.9, 80.0.
• Turn in the quest to [npc=75186].

7. The Butcher of Bladespire - (Video)
• Accept The Butcher of Bladespire, from [npc=75186], at coords 70.7, 78.5.
• Exit the small building and defeat [npc=74254], located at coords 51.0, 73.8.
• Travel back to [npc=75186], at 70.7, 78.5, and turn the quest in.

8. Armed and Dangerous - (Video)
• Accept Armed and Dangerous and To the Slaughter, from [npc=75186] at coords 70.7, 78.5.
• Exit the small building, and go inside another whose entrance is at 62.7, 68.0.
• Click on 8 [npc=76547] to free/arm them.

To the Slaughter
• Kill 10 Bladespire Ogre mobs.
• Travel to coords 50.6, 33.1 and turn in the quests Armed and Dangerous and To the Slaughter to [npc=75177].

9. Last Steps - (Video)
• Accept Last Steps from [npc=75177] at coords 50.6, 33.1.
• Click on the Climbing Ladder next to [npc=75177] to climb it.
• After the cut-scene, defeat [npc=74105].
• Turn in this quest to [npc=75188], at coords 66.2, 56.4.

10. Moving In - (Video)
• Accept Moving In, from [npc=75188] at coords 66.2, 56.4.
• Click on the [npc=75560] nearby to ride it (it will automatically follow [npc=75188].
• Turn this quest in to [npc=70860] at 43.0, 41.5.