Stronghold Portal

Stronghold Portal is a thing to scan in Metroid Prime Hunters that is accessible once you have collected three artifacts.

Description
This is a portal that requires the Cartograph Artifact, theBinary Subscripture Artifact, and the Attameter Artifact. It leads to a stronghold void either to battle a Slench, or a Cretaphid on the Celestial Archives, Alinos, the Vesper Defense Outpost, or Arcterra.