You and up to eight willing creatures within range project your astral bodies into the Astral Plane. The material body you leave behind is in a state of suspended animation; it doesn't need food or air and doesn't age.
Your astral body resembles your mortal form in almost every way, replicating your game statistics and possessions. The principal difference is the addition of a silvery cord that extends from between your shoulder blades and trails behind you, fading to invisibility after 1 foot. This cord is your tether to your material body. As long as the tether remains intact, you can find your way home. If the cord is cut — something that can happen only when an effect specifically states that it does — your soul and body are separated, killing you instantly.
(see PHB for full description)
for each creature you affect with this spell, you must provide one jacinth worth at least 1,000gp and one ornately carved bar of silver worth at least 100gp, all of which the spell consumes
Creo Memet ti Astrum Superum
Verbal Component (Alternative):
Project our forms to the Astral Plane; Leave this world where our bodies remain.