The Cosmic Entity Plane is an area separate from Gielinor in which Starflowers grow. The only inhabitant of the plane is the Cosmic Being. It can only be accessed by starting A Fairy Tale II - Cure a Queen, and the only way to access it is via the fairy ring teleportation system, using the coordinates CKP. Either a dramen staff or lunar staff is required to use the fairy rings if A Fairy Tale III - Battle at Ork's Rift has not been completed.
This area is only useful for collecting Starflowers, which are used in Magic essence potions. During the quest A Fairy Tale II - Cure a Queen, the player must visit the plane to pick a Starflower to heal the fairy queen. After the quest, players can revisit the plane to collect more Starflowers for making Magic essence potions if they wish. When first arriving in the plane, there seem to be no flowers; however, they will start blooming after a minute or so, and players will be able to pick them.
- Using an Orb of oculus, players can see the Fishing Trawler ship to the west of the plane, and the entrance to the Cosmic altar to the east.
- The Cosmic Plane could also be seen from the Cosmic Altar, but this is no longer possible.