Eternal Tree (Legend)
Somewhere in the far, far, north beyond Jǫkullfold is a great pillar of blue energy that connects heaven and earth. It supposedly holds great power.
The lands beyond the Ironclaw Wall are unexplored
Variations & Mutation
It supposedly has great power that can be accessed by a god or godlike being. It may lead to a realm made of magic
A giant tree is the symbol for White Magic
There's a, dubious, account from an explorer who may have actually seen it first hand