Mikulas, the Keystone (Japanese: 要石のミクラージュ, Kanameishi no Mikurāju) is a Tyrant in Xenoblade Chronicles X. It is a member of the Falsaxum family. It can be found at level 34 at West Ciel Sandsea in Sylvalum, submerged half in the ground. Defeating it is required to complete the eponymous basic mission Mikulas, the Keystone.