Realm of Phantoms
Home of REDACTED and Throne of EXTRAREDACTED. Tenamus is the realm where hope goes to die, likely consumed by the hordes of phantoms that cross the darkened skies. This realm is forced to slowly draw Glow from other realms like a massive parasite unaware of the doom it brings upon itself. But this realm is also a favorite of Warlocks and evil conjurors that wish to call upon a power far greater than their merely sophontic minds can understand. Even Exarchs are willing to make bargains with the Phantom-Kings of Tenamus.
Morius is the Decay and Air Realm, it is located in the Death's Hourglass Constellation. Trying to keep this draft as spoiler friendly as I can.
Imagine an endless landscape made of black stones, dry earth, and dying plants. Now imagine above it is a great storm of darkness that is slowly consuming all light. As you walk across it, the ground begins to crumble and shatter revealing that the realm is actually hollow, but not empty. Inside it are the nightmares of the cosmos. You look down into the darkness and the darkness returns your gaze.
There is an actual magic black hole above the realm draining it of power, slowly crumbling it away.
Phantoms, Undead monstrosities that use Souls as a fuel source for their magic. They have made deals with dozens of realms and been the death knell to hundreds more. Inside the realm are entities older than time itself, they are beyond sophonce. They may be elemental.
Much of it has died off from life being drained, what does remain is able to survive off corpses, darkness, and evil.
Nightmares, great steeds made of shadows and hate are an example of the few reamining fauna to Tenamus. Each beast that remains is a mockery of the once verdant realm Tenamus was once in a history long past.
Energy, even Faith and Glow, is hard to acquire on this realm. It is all sucked up into the great black hole.
There are no scientific advances anymore, only new ways to wield corrupting magics of shadow and decay. The beings trapped on this realm know of the future, the past, and the present. They use fear as a source of magic rather than anything else used by everyone else in the cosmos.
Realm of Phantoms
Few denizens of Ravare know of Tenamus.