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King Jaron decided to widen the Passage to allow for further expansion in the Cavern. In 6430 DE he made the announcement. Rock Biter and Burrower were both unveiled in a great ceremony and immediately put to work.
In 6510 a new cavern was discovered; however, the Guild of Surveyors, led by King Rikooth's older brother, reported that it would be very expensive to build in. After confering with his advisers, the King ordered Burrower and Stone Eater to continue the tunnel past the cavern.