Elemental Weapon - Sky
Remnants of Ymir's old power, now inaccessible to him as a reborn mortal. But they can still be of use in the form of elemental weaponry: this one is a set of magical foci imbued with the element of Sky. It makes for a decent poking implement in a pinch, too.
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A thought came to me and decided that Ymir's weapons will be themed after his old self, somehow.