Lords of Creation: Ancients of the Void
Crabs that are made of pink crystal and that are two feet tall at their tallest. They were born in the Dream as the first Maruk’s thoughts and the ooze interacted, while Mekhet’s power still flowed through it strongly. Mekhet’s departure from the Dream carried ooze crabs out of there, causing them to spread to the Ooze Rivers of the First Material World. Typical ooze crab lifespans are to 90 years old, barring accident.
Their first interaction with other races involved a fatally wounded Wayfinder and a Red Beast. Hundreds of crabs fell against the Beast as they tried to save the Wayfinder but met too late. For their sacrifice, though, the Ooze Crabs were granted a gift by Kereth, and allowed to go back to the Realm of Dreams upon their deaths, where they talk with the living. They communicate ideas this way, ignoring distances. Not too useful for sending messages, though, due to how much it spreads out.