Prompt code:
A shirt design with the Yggdrasil tree in stunning detail. The tree has roots and branches that sprawl across the entire shirt. The tree is intricately interwoven with symbols representing the Nine Worlds. Small, mythical creatures like Nidhogg (the dragon gnawing at the roots) and Ratatoskr (the squirrel running up and down the trunk) are present. The background features a starry night sky or an ethereal aurora, highlighting the tree's cosmic significance.
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