Blaudolch, the Chalcedony (Japanese: 王髄のブラオドルヒ, Ōzui no Buraodoruhi) is a Tyrant in Xenoblade Chronicles X. It is a member of the Progen family. It can be found at level 20 at Seabird's Beak in Sylvalum. Though it can be found at any time of day, its appearances are rare, and a White Progen may be found in its place. Defeating it is required for the completion of Squad Task No. 12.