Dead Drowning

Mimic as the undead do and invade their grey realm of crumbling towers and ash. An outsider here you are naked, weak and feeble, upon arrival the caster must make a Constitution 14 Saving Throw, on a fail all Hit Points and Spell Slots are halved until you leave. Success, only Hit Points are halved.

This undead realm is not a separate Plane, the bodies, ghosts and walking corpses here can only be recognizable to the caster. The caster may summon any number of ghosts to speak with for the 1 Hour they must spend in this realm. This Spell cannot bring others with the caster. However the realm is shared between all who know the Spell.