Arrived on earth from a fallen star aeons ago, the very lowest rank of this alien species has a diamond humanoid body with fluorescent orange stripes. They have no head, but a very large, fanged mouth opens in their chest. They cultivate the gems that spout from their very mouth in the uppermost caves formed by the crater from whence they landed, sometimes giving those alien minerals in exchange of tasty terrestrial metals (especially those delicious man-made alloys). Their silent language is complex and subtle, completely based on sending and receiving vibrations through the ground. Instinct: to take terrestrial metals

• Gnaw away a bite from a metal item
• Send an alarm stomping on the ground
• Spout mystical gems
• Silently offer an exchange