The World TreeEdit
The World Tree exists in the Cosmos. It is the origin of all life on Kaldheim, and you can see the branches in the sky in all ten realms.
Magical creatures known as Cosmos monsters live and thrive in the space between the realms. Most of them resemble a recognizable animal, such as a wolf or eagle, but grown to a prodigious size and enhanced with mystical abilities and supernatural knowledge. These monsters are incredibly old. They are said to be the first "fruits" of the World Tree, and they now serve as its guardians, maintaining the structure of the plane and its realms. Most of the Cosmos monsters can move freely between the realms, often bringing havoc and destruction with them when they enter a realm.
The Cosmos monsters share little in common besides dwelling in the Cosmos. They vary in size from the unimaginably massive Cosmos Serpent to the tiny, mischievous squirrel Toski. Many of the Cosmos monsters like Sarulf are well-known, appearing in numerous sagas, while others have never been seen and their deeds are unknown.
The peoples of Kaldheim believe that when the Cosmos monsters were born, all the secrets of the world — including events that hadn't yet happened — were locked inside their minds. Mages from many realms, and even gods, have devoted their lives to unlocking those secrets. By making every Cosmos monster submit to him one by one over the course of centuries, the god Alrund was able to take their secrets from them.
Notable Cosmos MonstersEdit
It's challenging, but not impossible, for denizens of one realm to cross the Cosmos and enter another realm. As realms shift on the World Tree, passages called Omenpaths sometimes open between realms. Inhabitants of one realm can use an Omenpath to reach another one. Sometimes this is as simple as walking through a shimmering light on the landscape, but other Omenpaths are more treacherous and involve crawling through shifting tunnels and being deposited unexpectedly on the mountaintop of an unfamiliar realm. Once an Omenpath between realms has opened, some powerful mages can close and reopen them at will. The opening of an Omenpath is often a precursor to the two realms overlapping in a violent Doomskar.
Because of the Cosmos Elixir that makes the gods what they are, the gods of Kaldheim are immune to the disorienting effects of the Cosmos and can cross between the realms more easily than other races. Shapeshifters' ability to change form and the Omenseekers' rune-enhanced longboats also enable passage between realms. On the other hand, a Planeswalker's ability to travel to other planes cannot be used to traverse the Cosmos, with Kaya requiring Cosima's longboat and Tibalt using the Sword of the Realms.
- Ari Zirulnik (January 8, 2021). "Planeswalker's Guide to Kaldheim, Part 1". magicthegathering.com. Wizards of the Coast.
- Ari Zirulnik and Jenna Helland (January 21, 2021). "The Legends of Kaldheim". magicthegathering.com. Wizards of the Coast.
- Roy Graham (January 13, 2021). "Awaken the Trolls". magicthegathering.com. Wizards of the Coast.
- Roy Graham (January 20, 2021). "Kaldheim Episode 3: The Saga of Tibalt". magicthegathering.com. Wizards of the Coast.