Valhalla (Japanese: 戦死者の館, "Senshisha no Yakata" / lit. "Hall of Fallen Warriors") is the backside of the Divine Fortress. Despite having a name based on the Norse mythology, the area itself is not inspired by the same mythology, and it might change later.
At (D-1), use the Clay Doll Outfit to cross the purple lasers. Then, jump on the trap near the ladder and use double-jump to get into the area. Finally, break all 4 Seals.
Somewhere along the way, there has been a patch that places an unbreakable wall after the laser in D-1 and removes the dais left of the mechanism that would grant passageway to the pressure plate. You now have to enter this area by entering the door in Shrine of the Frost Giants (E-1). The pressure plate in this room also removes the aforementioned unbreakable wall.
Defeat Vucub-Caquix at (C-3); Crawl through the corridor and place a Weight on the bottom-left dais. If you press up/down on the staircases, you can make your way all the way to the other dais and create a shortcut for yourself.
Go to (A-4) and throw a Shuriken at The Trickster of Yggdrasil. You have to see him 2 more times (left side of D-2, then behind the fence at D-3) and then talk to Brihaspathi at (D-3).
Do not touch the spiraling light.
It will burn anything not born of this land to cinders.
D-11st Child: Anunnaki
Shiva sits in the heavens, from which he drops the light that burns the land below.
Vishnu sits in the heavens, from which he watches the land below.
The two gods fall from heaven over an old conflict.
Leaving behind Brahma, who is relocated to one of Yggdrasil's branches.
The primeval entity of many heads and arms, who watches over this world of his
creation.
A-26th Child: Vanir
This is the fortress of the Vanir, who defied the Aesir who sought to destroy
Yggdrasil. The calamity Vritra is sealed here until the day comes for the End.
C-26th Child: Vanir
Do not approach the Corridor of Blood.
Doing so will invite the End.
Those who brave the Corridor of Blood will be exiled to the land that is not.
D-26th Child: Alfr
A child's heart sleeps in the Spiral Boat.
The spiral depths are nestled within the deeper, darker depths of the heart.
The child's heart is the final gate.
E-21st Child: Anunnaki
The Kamandalu Water Pot is tolerance.
It is the vessel which will tolerate any battle that provokes chaos.
A-36th Child: Alfr
There is a hidden means of binding to an Ankh.
The fate of those who bury their soul within an Ankh is tied to its Guardian.
B-36th Child: Alfr
This is Valhalla.
Where the souls of those fallen in battle are gathered.
B-36th Child: Alfr
The blue eye protects Yggdrasil.
It levels divine punishment against those who dare to harm the holy lands.
The red eye protects Yggdrasil.
It levels divine punishment against those pitiful few who ransack these lands.
C-36th Child: Vanir
The gold-plated giant Vucub Caquix is protected by his two sons.
The brothers Zipakna and Cabracan.
He will be awakened when the their lives are spent.
D-36th Child: Alfr
Dissonance lingers where Children of the same seed are in conflict.
When the calamity that governs conflict disappears, dissonance will be released.
And the stone with a face swallows it.
A-46th Child: Vanir
Cast a spear that penetrates the earth through the hole that runs through it.
B-46th Child: Vanir
The true lord of the Asura who deposed Vishnu from his seat in heaven, Jalandhara. He is ensealed here so his terrible power may not be free.
C-46th Child: Vanir
Sit to proceed.
D-46th Child: Lokapala
There are two stone tablets that respond to the holy chalice.
The waves that warp the chalice's power will lead you to the black stone tablet.
B-5Underworld
There is one who assumes the same form as you.
And with it, the same strengths, against which there is no victory.
If you wish to destroy it stock strength in your body before unleashing it.