Battle at Valhalas: Thane Deathblow

Banahögg in icelandic simply means killing blow (i.e. Deathblow). So Deathblow isn't only his nickname, but his real name too.

Here is the sequence of quests that lead to the Final Challenge.
(A for Alliance, H for Horde)

1A It's All Fun and Games
1H It's All Fun and Games
2 I Have an Idea, But First...
3 Free Your Mind
4A If He Cannot Be Turned
4H If He Cannot Be Turned
5A The Shadow Vault
5H The Shadow Vault
6 The Duke
7 Eliminate the Competition
8 The Bone Witch
9 Deep in the Bowels of The Underhalls
NOTE: You do not need to complete step 9, but you must be on the quest in order to loot Dr. Terrible's "Building a Better Flesh Giant", which starts step 10. I never handed in step 9, even after the Final Challenge, just to be sure.
10 The Sum is Greater than the Parts
11 The Art of Being a Water Terror
12 Through the Eye
13 Find the Ancient Hero
14 Not-So-Honorable Combat
15 Banshee's Revenge
16 Battle at Valhalas
17 Battle at Valhalas: Fallen Heroes
18 Battle at Valhalas: Khit'rix the Dark Master
19 Battle at Valhalas: The Return of Sigrid Iceborn
20 Battle at Valhalas: Carnage!
21 Battle at Valhalas: Thane Deathblow
22 Battle at Valhalas: Final Challenge

Enjoy! :D

SHADOW VAULT Quest Tree From Whiterock
Give + to 12/09/2008 Rawkster aswell.

                    1)It's All Fun and Games{H}
                    1)I Have an Idea, But First...
                    1)Free Your Mind
                    1)If He Cannot Be Turned{H}
                     |->Blackwatch*
                     |
Orgrim's Hammer(H)* 1)The Shadow Vault{H} The Skybreaker(A)*
         |         /  |         \             |
      Opportunity(H)* |         Exploiting an Opening(A)*
                     1)The Duke
                      |      |
2)Eliminate the Competition 2)Honor Challenge---->2)Get the Key
3)The Bone Witch            2)Shadow Vault Decree 2)Let the Baron Know    
 |->3)Reading the Bones      |____________________/
 |  R)Reading the Bones                    |->3)Vandalizing Jotunheim
 |                                         |->D)Leave Our Mark
 |->4)Deep in the Bowels of The Underhalls |->3)Crush Dem Vrykuls!
 |                                         |  D)Vile Like Fire!
 |->4)Revenge for the Vargul               |
 |                                        N)Vaelen Has Returned
4)The Sum is Greater than the Parts       3)Ebon Blade Prisoners
 |                                         |->D)Shoot 'Em Up
3)The Art of Being a Water Terror          |
 |                                        N)To the Rise with all Due Haste!
3)Through the Eye                         6)The Story Thus Far...
 |                                         |->D)From Their Corpses, Rise!
3)Find the Ancient Hero                    |->7)Blood in the Water
 |                                         |  7)You'll Need a Gryphon
3)Not-So-Honorable Combat                  |  D)No Fly Zone
 |                                         |->D)Intelligence Gathering
3)Banshee's Revenge                           +7)The Grand (Admiral's) Plan
 |                                             7)In Strict Confidence
5)Battle at Valhalas                           7)Second Chances
5)Battle at Valhalas: Fallen Heroes            7)The Admiral Revealed
5)Battle at Valhalas: Khit'rix the Dark Master
5)Battle at Valhalas: The Return of Sigrid Iceborn
5)Battle at Valhalas: Carnage!
5)Battle at Valhalas: Thane Deathblow
5)Battle at Valhalas: Final Challenge
Quest zones:
1)Shadow Vault_____2)Savage Ledge_____3)Jotunheim_____4)The Underhalls_____5)Valhalas_____6)Death's Rise_____7)Onslaught Harbor
D)Daily_____N)Not-needed_____R)Repeatable
*Click to see more info about that quest-line.
The Icecrown is done! Leave your comments/sugestions at my comment in Icecrown zone. Thanks everyone who helped me to make it via comments on wowhead and in-game pre-quest tracking.