Kaldheim is steeped in storytelling and song, and all of its denizens share a common ethos: it is a plane of warriors who boast of their great deeds and yearn to die heroically in battle, who fight hard and celebrate harder, and where great tales pass into myth through the ages. Pivotal to the plane is the Cosmos, a "realm between" which Planeswalkers cannot cross represented by a massive World Tree, from which ten separate realms hang like fruits. The realms are constantly shifting and, on occasion, may collapse unto each other. When this happens, a Doomskar occurs. This causes earthquakes, destabilization, and total chaos. There is no sun or moon in Kaldheim. Light is instead provided by the realm of Starnheim. In addition, the branches of the World Tree can be seen in the skies of the realms.