Board Thread:Theories/@comment-45305290-20200424023655

The tree Ymir Fritz falls into could be a nod to the legendary ash tree Yggdrasil, which also features wells, called "Brunnr" underneath it, just as Ymir Fritz falls into the "well" inside the tree.

In fact, AoT borrows A LOT of elements from both Titans in Greek mythology and Jötnar from Norse mythology, mixed with several general tropes seen in various real-life religions. 