Being a demiplane spell you are able to create a shadowy door on the flat solid surface which you are capable to see within a range. The door is almost large enough for allowing a Medium creatures in order to pass via the unhindered.
Suppose, when an opened, the door leads for the demiplane which usually appears for being an empty room 30 feet in each dimension, made up of wood or stone. Whenever the spell ends, the door shall be disappeared and even any creatures or some objects inside the demiplane remain trapped there, like the door shall also be disappeared from the other side.
Each and every time you would cast this particular spell, you can easily create a new demiplane, or else have the shadowy door which has been connected to the demiplane that you created with with the previous casting of this spell. In an addition, if you know the nature and the contents of a demiplane that have been created by a casting of this spell by another creature, you can simply have the shadowy door connect to its demiplane instead.
You can also read about feather fall spell 5e
Attributes Of Demiplane 5E Spell
|Casting Time||1 action|
|Target||A flat solid surface that you can see within range|