Crystal Knife

Knapped quartz that bites what no steel can touch.

A blade of knapped quartz on a glyph-covered leather hilt, gleaming to those with forest eyes.

When you wield it as a weapon against the manifest form of any spirit, it ignores armor and deals +1d4 damage. If that 1d4 comes up a 4, the knife shatters into useless shards.