The Primordial Realm is a dimension different than Gielinor, which can be visited during the Stealing Creation activity. It is the only place that still has what composed everything in the universe, sacred clay.
As there are no restrictions on combat in the Primordial Realm (other than the fact that you cannot attack members of your own team), many adventurers enjoy taking the battle more seriously by attacking their enemies as they gather resources, build items, and so on. This is also a good way of gathering clay, as any foes you defeat will drop all of their items (unless they have a Protect Item prayer active), which you can pick up and return to the tables in your base.
There are many Fog Banks found in this realm, in which one may completely conceal oneself.
Everything in the realm is made of sacred clay. This can be gathered by using skills, as the clay comes in the form of skilling spots, such as trees or rocks.
The primordial realm is a flat, square, and basic place filled with fog banks and sacred clay resources. At opposite corners of the primordial realm are bases where players of opposing teams can deposit sacred clay and sacred clay items.
Gielinor • Zanaris • ScapeRune • Gorak Plane • Cosmic entity plane • Kethsi • Pandemonium Realm • Fisher Realm • Spirit Realm • Spider Realm • Shadow Realm • Abyss and Abyssal Area • Thordur's Black Hole • Enchanted Valley • Dream World • Killerwatt plane • Land of Snow • The Land of Sunlight • Land of Holly and Hawthorn • Primordial realm • Freneskae • Puro-Puro • Realm of the Gods • The Void • Spirit Plane • Yu'biusk • Runespan • Britain • Vampyrium