Obstinate Stone

Description
This is a large stone, slightly bigger than one of your paws, which the Water spirit in the Heartbone River Valley gave you. It called it "obstinate", but as usual for a spirit, its precise meaning was unclear. It allows light to pass through it, sometimes converting it into color at certain angles.

Hint
Impress a Water-spirit with your wisdom.

Where to find
Obtain from Water spirit by answering all its riddles correctly. See water spirit event for more detail.

Research Description
Apparently, this is a special kind of stone called a "diamond". It is exceptionally hard and difficult to destroy. Even the sharpest metals cannot scratch it. It is highly prized by the Others, for some reason.

It is worth 50 shiny things in trade.

Usage
Use in Delver Labyrinth to get to the salamanders, no elemental checks.