Yggdrasil Wood Valheim 1.0.20
Yggdrasil Wood is a natural resource found in the Mistlands of Valheim. It is used to craft Himminafl and build Ballista.
“Godflesh, wood from the Great Tree.”
Yggdrasil Wood is a material, described in the game as "Godflesh, wood from the Great Tree." It first becomes available in the Mistlands. Each piece weighs 2, a stack holds up to 50, and it can be teleported.
You use it to craft Himminafl, Jotun Bane, Skull Splittur, Grappling Hook, Black Metal Pickaxe, Demolisher, Carapace Spear, Staff of Embers, Staff of Frost and Staff of Protection.
It is also a building material for the Ballista, Black Forge, Drakkar, Dvergr Sharp Stakes, Dvergr Spiral Staircase Left and Dvergr Spiral Staircase Right.
Found in the world
It is placed in the world by the world generator: see where to find Yggdrasil Wood.
Used to craft
Black Metal Pickaxe, 
Carapace Spear, 
Demolisher, 
Grappling Hook, 
Himminafl, 
Jotun Bane, 
Skull Splittur, 
Staff of Embers, 
Staff of Frost, 
Staff of Protection.
Used to build
Ballista, Black Forge, Drakkar, Dvergr Sharp Stakes, Dvergr Spiral Staircase Left, Dvergr Spiral Staircase Right, Dvergr Stakewall, Eitr Refinery, Galdr Table, Hexagonal Gate, Rune Table, Sap Extractor, Wisp Torch, Yggdrasil Wood Stack.
Other material items
Acorns, 
Amber, 
Amber Pearl, 
Ancient Bark, 
Ancient Coin, 
Ancient Metal, 
Ashlands Gourmet Bowl, 
Ashwood, 
Asksvin Bladder, 
Asksvin Hide, 
Asksvin Neck, 
Asksvin Pelvis.