Tetlaven

Tetlaven is the Dwarven name for an electric-blue gel found deep underground. It has many useful properties, chief among them being its tendency to lose viscosity when heated and to harden into a tar-like substance when exposed to an electrical current.

Ecological purpose
Tetlaven is found only in pools deep underground, in the vicinity of a certain type of glowing fungus. Strange subterranean creatures - similar to the creatures which live deep in the oceans of the real world - owe their existence to tetlaven, as they drink it and prey on the plants and animals which live off it.

Dwarven technology
The Dwarves love tetlaven for its strange physical properties, including its ability to recharge certain crystals.