An Ancient Awakens

To clarify a bit: this quest temporarily ends the Tortolla quest chain, with Ysera appearing and letting you know which ancient still needs help, in this case Avianna.

The next quest can be found at Nordrassil from Tiala Whitemane (just outside the building), it's called Wings Over Mount Hyjal.

The Return of the Ancients Quest Tree From Whiterock
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Return from the Firelands{H}*──>G)The Fires of Mount Hyjal
 |				4)Fighting Fire With ... Anything
G)Aviana's Legacy
 |
 | S)Wings Over Mount Hyjal<──Return to Nordrassil*
 |OR|			  ┌──────────┴──────────┐
1)An Offering for Aviana 1)Scrambling for Eggs 1)The Wormwing Problem
S)A Plea From Beyond	  ├─────────────────────┘
1)A Prayer and a Wing	 1)A Bird in Hand
 ├────────────────────────┘
2)Fact-Finding Mission
 ├─────────────────┬──────────────────────┐
2)Sethria's Brood 2)The Codex of Shadows 2)A Gap in Their Armor
 |                2)Egg Hunt             2)Disassembly
 ├─────────────────┴──────────────────────┘
2)Sethria's Demise
1)Return to the Shrine
1)An Ancient Reborn
 ├>3)The Hatchery Must Burn
 | 3)Flight in the Firelands
 | 3)Wave One
 | 3)Wave Two
 | 3)Egg Wave
 | 1)Return to Aviana
 |
 | The Return of the Ancients*
 |  ├─────────────────────┬────>4)If You're Not Against Us...
 | 4)Save the Wee Animals |	4)Seeds of Their Demise
 | 4)Oh, Deer!		  |	4)A New Master
 |  |		 	  |	4)The Name Never Spoken(ver2)
 |  | 4)Disrupting the Rituals	4)Black Heart of Flame
 |  ├──┴─────────────────────────┘
 | S)Last Stand at Whistling Grove
 | 4)The Bears Up There
 | 5)Smashing Through Ashes
 |  ├───────────────┬──────────────>6)Firebreak
 | 6)Fresh Bait    6)Durable Seeds  6)Prepping the Soil
 | 6)Hell's Shells  └────────────────┴──────────┐
 | 5)Tortolla Speaks				|
 |  ├────────────────────┐			|
 | 5)Breaking the Bonds 5)Children of Tortolla	|
 |  ├────────────────────┘			|
 | 5)An Ancient Awakens				|
 ├──┴───────────────────────────────────────────┘
6)The Last Living Lorekeeper<──Return from the Firelands{H}*
6)Firefight
4)Aessina's Miracle───┬>7)Hyjal Recycling Program
7)Tortolla's Revenge  └>7)Lost Wardens
 ├>7)Breakthrough	7)Pressing the Advantage
 |
7)The Hammer and the Key
8)The Third Flamegate─────>8)The Time for Mercy has Passed
8)The Strength of Tortolla
8)Finish Nemesis
7)Tortolla's Triumph
9)The Ancients are With Us──>Commander Jarod Shadowsong*

Quest zones:
1)Shrine of Aviana_____2)Sethria's Roost_____3)Firelands Hatchery_____4)Grove of Aessina+The Inferno_____5)Ashen Lake+Sanctuary of Malorne_____6)The Flamewake_____7)The Scorched Plain_____8)The Crucible of Flame_____9)Nordrassil
G)Gluing Separate Questlines_____S)Skippable
*Click to see more info about that quest-line.

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Aessina quest chain

1. The Fires of Mount Hyjal (breadcrumb quest)
1. Fighting Fire With ... Anything (kill 10 firestorms)

2. Save the Wee Animals (gather 10 animals)
2. Oh, Deer! (escort 3 fawns)

3. If You're Not Against Us... (Persuade Blackhorn)
3. Seeds of Their Demise (gather 8 Bileberries) 
3. A New Master (Use quest object on a dead orc)
3. The Name Never Spoken (toggle 3 objects)
   The Name Never Spoken
3. Black Heart of Flame  --.    (use quest object to call Thol'embaar and kill it)
                           |
4. Disrupting the Rituals  V  (kill 6 Inferno Lords)
4. Last Stand at Whistling Grove (need Black heart of Flame)(go to Taldros)
4. The Bears Up There (climb tree, save cubs)
4. Smashing Through Ashes (kill 8 Charbringers, IN HYJAL)
4. Durable Seeds (collect 10 seeds)                  |
                                                     |
      5. Fresh Bait (get 4 entrails from hounds ) <----->  6. Firebreak (kill 10 lava surgers)
      5. Hell's Shells (use bait, toggle Nemesis)          6. Prepping the Soil (toggle object, defend it)
      5. Tortolla Speaks -------------------.
                                            |
6. Breaking the Bonds (unchain Tortolla) <-----> 7. Children of Tortolla (kill 6 corruptors in lake, get ilvl 288 rare)
            |                                                 |
            .-------------------------------------------------.
                  |
                  V
8. An Ancient Awakens (go back to Hamuul Runetotem)

9. The Last Living Lorekeeper (go to Nordu)
9. Firefight (kill 5 tormentors)
9. Aessina's Miracle (go to Hamuul Runetotem, get ilvl 288 rare)

(The map of Hyjal phases at this time. The western part is no longer burnt. Tortolla moved)

10. Tortolla's Revenge (go to Tortolla)
    Tortolla quest chain begins