Vacuum

You create a magic portal for a newly created dimension and can put every médium or tiny item or creature into it. Only you have acces for that dimension by this spell and plane shift and gate can't get acces to that dimension. This spells can only get acces to vacuum dimension if a magic item that reproduce this spells effect touches in some DNA of the spellcaster who have casted the vacuum spell.

The items or cretures that are in your vacuum dimension are constantly falling in a totally dark and infinite dimension  filled with oxygen. Exposed nonmagical flames are totally estinguished in that dimension.

If the spellcaster who have casted the vacuum spell cast this spell in his vacuum dimension, the portal for exit appears in the same location of the portal he entered, even in another vacuum dimension.

You use an action to open the portal and a bônus action to close it.