This is (another) entry in the (endless, tiresome, and awful) “Externals” storyline. Some Eternals trick Moonstar into going on a mission just so they can syphon her powers, but they are unsuccessful.
The Eternals are supposed to be Godlike–nearly omnipotent. These stories just make them lame.
At the end of the issue, Cannonball gets a mysterious package from Genosha–that will serve as the basis for the next story in this series.