Inventober #2 Bjarkasongr
The sword is light as a feather and if one listens closely somewhere quiet it hums faintly, like the reverberation of a tree bending in the wind or a single note of birdsong. +3, the sword is terribly sharp and will never dull; if it chips in combat the pieces quickly fly back into place as if by magnetism. On a hit victim must roll a CON save of 20+ or take 2d10 bleed damage per turn. Can be snapped with great effort, but it will bend almost to a complete circle first. If it is snapped it loses its properties and can only regain them if it is reforged and offered a worthy sacrifice in a birch forest. I suggest it be found among the rocks of a cave as part of an ancient shipwreck, or in a copse of birch with a tree grown partially around it.