Arachnite

Little nail-sized,four-legged gems that act liike a swarm of beetles.
They are hostile if provoked and very annoying.
However their double-sided pyramid shaped gem bodies are very desired as the gems have magical properties, can be used for spells, are good focusses and are very malleable (unlike the Shadow Glass which is believed they spawn from).

Common use

Arachnite is commonly used for spells, enchants and amplify other magical properties.

They understand Primordial! Or Muireall speaks Bug one of the two...

Value

1 gem = 100 gp