Despite the "rock" in the name, shevrocks are a type of crystal. Discovered by the Therians in the deeper tunnels of the Rowan Caverns? and once a closely guarded secret, shevrocks are large formations that glow in the dark and serve as lighting.

No one has yet learned how shevrocks work, but they're often (very carefully) shaped by artisans and can be quite expensive, partially because they seem to last forever but also because Therians own full rights and allow no else to mine them.

Shevrocks can vary in colour from a bright white-blue to a soft orange, so they're sometimes used as mood lighting in restaurants and such. Brightness doesn't seem to be affected by size, but is more a luck of the draw.