The Cosmic Beings were nine individuals who attempted to wield the Power Stone.
This group attempted to harness the abilities of the Power Stone by sharing its power between them, achieving this through linking themselves together. The effects were short-lived, however, as the energy of the stone disintegrated all of them after a few moments.
The Collector showed a projection of this event to the Guardians of the Galaxy as he explained the history of the Infinity Stones to them. Carina and the Guardians looked at the projection in shock witnessing the power of the stone.