It’s not WoT related, but I have an idea for a sleeve.
I already have a cross on my arm, Celtic knot work. Now, I’m thinking a pentagram on my wrist, almost portal like. On the opposite side of my arm I want Yggdrasil standing tall, with a branch over the cross. Dangling from the branch will be a piece of fruit, and coiling around the cross will be a serpent, reaching for the fruit. Michael will be above the tree, arrayed for battle, with a trident aimed at the serpent.
on the other side there will be Odin, hanging from the tree Huginn and Muninn on his shoulders.