Since we now know every single Realm in Ninjago lore, here's a quick guide to them all. Spoilers ahead.
First up, the 10 realms introduced in the original series:
And now the Realms introduced in Dragons Rising:
Imperium
• Amid a mostly barren wasteland lies the high-tech city of Imperium, ruled by the Vespasian-Orus royal family. Under the tyrannical rule of Empress Beatrix, the city is powered by draining the energy of dragons. Outside of the city, there is also the Land of Lost Things, where people and items emerge after being lost.
• Introduced in Dragons Rising S1 and appears in every season since.
• Notable residents: Sora (formerly), Beatrix, Percival, Geo, Cole
• Notable locations: City of Imperium, Land of Lost Things
• The Imperium Portal Gate was located beneath the City of Imperium, but was destroyed. The parts ended up in the Land of Lost Things, where they were restored by the Elemental Master of Fusion.
Land of Lee
• A Realm with a (technically) sole resident: Lee, a man who can duplicate himself and whose clones form a hivemind. When the Merge introduced him to the existence of other people, he built an underground town so he could always have friends.
• First mentioned in Dragons Rising S1 and introduced in S3.
• Notable residents: Lee, Lee, Lee, Lee
• Notable locations: Community of Lee, Cavern 5 Waterslides, Graveyard
• The Land of Lee Portal Gate has not yet been found.
Mysterium
• A strange Realm where magic is abundant and sorcerers of various races share their knowledge of spellcraft with each other.
• Introduced in Dragons Rising S2 and appears in S3.
• Notable residents: Gandalaria, Powerlid, Kreel (formerly)
• Notable locations: Abraclabria, Gandalaria's Monastery, Cave of Bells
• The Mysterium Portal Gate is located within Gandalaria's Monastery.
Land of Eternal Dawn
• The most mysterious of the Realms. It's dawn at all times, and in every direction. This Realm will try it's best to prevent you from leaving by summoning exactly what you need when you need it, and messing with your head so you don't notice how unusual it is.
• Introduced in Dragons Rising S2 and appears in every season since.
• Notable residents: Lord Ras
• Notable locations: Portal Gate, Shadow Dojo
• The Eternal Dawn Portal Gate is located within the ruins of a Monastery.
Land of Monsters
• A horrible place full of vicious monsters. They say it's impossible to survive in the Land of Monsters without becoming a monster yourself, in both the metaphorical and literal sense.
• Introduced in the Legends shorts and appears in Dragons Rising S4.
• Notable residents: Kai (fornerly), Daidan, Bolsen, Fuzz
• Notable locations: Cave of Change
• The Land of Monsters Portal Gate has not yet been found.
The Whispering Wood
• A beautiful forest where mortal life first began. Energy from this Realm flows through all the other Realms to keep them alive. Whenever a 'Green Ninja' (the Elemental Master of Life) comes of age, they must travel to the Whispering Wood to perform the Ritual of Unrooting and refresh the energy.
• Introduced in Dragons Rising S3 and appears in Dragons Rising S4.
• Notable residents: Arc Dragon of Life
• Notable locations: Temple of the Green Ninja
• The Whispering Wood Portal Gate is located within a Monastery.
Umbrasilvis
• A Realm similar to medieval Europe. It's currently unknown what, if anything, lay beyond the quiet village of Umbrasilvis before the Merge.
• Introduced in Dragons Rising S4.
• Notable residents: Freya, Grand Inquisitor (formerly)
• Notable locations: Freya's Windmill
• The Umbrasilvis Portal Gate has not yet been found.
Bonus location: The City of Temples
• This city is not part of any existing Realms, nor does it count as a Realm itself. Before the Merge it would travel between the Realms hosting the Tournament of the Sources, where Elemental Masters compete fo be considered the best. After the Merge, it now resides in the Merged Lands alongside all the Realms.
• Introduced in Dragons Rising S2 and appears in S3
• Notable residents: Roby, Bleckt
• Notable locations: Tournament Museum, Portal Gate Temple, Vault of Focus
• While the Realms all have one Portal Gate each, the City of Temples has a room that leads to every Portal Gate. The gate to the Cloud Kingdom is currently destroyed, but all other active ones are intact.
And just for good measure, a quick recap of the Merge:
• The Merge was a world-changing event where Ninjago and the 16 Realms all fused into one, creating the Merged Lands. This event, unsurprisingly, changed people's lives forever - families were separated, lives were lost, and the Ninja were scattered across the Merged Lands, not knowing if the others were even alive for several years.
• The Merge happened between S15 of the original Ninjago and Season 1 of Ninjago: Dragons Rising, and it's currently unknown how or why it happened, only that it has something to do with Master Wu.
• One of the side effects of the Merge was the creation of the Portal Gates across the Realms. Every Realm has their own Gate (many of which are inside Monasteries identical to the Monastery of Spinjitzu), and the Gates allow for nearly instantaneous travel between the Realms.












