Coffin of Preservation

You can put a creature inside the coffin required for the material cost, as an action you can then shunt the coffin and the corpse into a extra dimensional space.

The coffin that has to be made for this spell costs 50 gp per size class starting with tiny (Tiny=50 gp, Medium=100 and so on), there is no limit to the amount of coffins this spell can affect. Every coffin requires it's own gem that it can bond itself to.

The coffin can only carry the corpse of a creature whose size matches the coffin (can not put a small creature inside a medium coffin), the corpse does not decay while inside the coffin. A coffin can also carry a undead creature you have control over, if the spell or effect that lets you control the undead has a duration, that duration is paused while inside the coffin.