Magic Jar

Your body falls into a catatonic state as your soul leaves it and enters the container you used for the spell's material component. While your soul inhabits the container, you are aware of your surroundings as if you were in the container's space. You can't move or use reactions. The only action you can take is to project your soul up to 100 feet out of the container, either returning to your living body (and ending the spell) or attempting to possess a humanoids body. You can attempt to possess any humanoid within 100 feet of you that you can see (creatures warded by a protection from evil and good or magic circle spell can't be possessed). The target must make a charisma saving throw. On a failure, your soul moves into the target's body, and the target's soul becomes trapped in the container. On a success, the target resists your efforts to possess it, and you can't attempt to possess it again for 24 hours. Once you possess a creature's body, you control it. Your game statistics are replaced by the statistics of the creature, though you retain your alignment and your Intelligence, Wisdom, and Charisma scores. You retain the benefit of your own class features. If the target has any class levels, you can't use any of its class features. Meanwhile, the possessed creature's soul can perceive from the container using its own senses, but it can't move or take actions at all. While possessing a body, you can use your action to return from the host body to the container if it is within 100 feet of you, returning the host creature's soul to its body. If the host body dies while you're in it, the creature dies, and you must make a charisma saving throw against your own spellcasting DC. On a success, you return to the container if it is within 100 feet of you. Otherwise, you die. If the container is destroyed or the spell ends, your soul immediately returns to your body. If your body is more than 100 feet away from you or if your body is dead when you attempt to return to it, you die. If another creature's soul is in the container when it is destroyed, the creature's soul returns to its body if the body is alive and within 100 feet. Otherwise, that creature dies. When the spell ends, the container is destroyed.

By casting magic jar, the caster places his or her soul in a gem or large crystal within spell range (known as the magic jar), leaving the body lifeless. The caster may then attempt to take control of a nearby living creature within spell range, forcing its soul into the magic jar. The caster may move back to the jar (thereby returning the trapped soul to its body) and attempt to possess another body. The spell ends when the caster's soul returns to his or her own body, leaving the receptacle empty.

To cast the spell, the magic jar must be within spell range and the caster must know where it is, though he or she does not need to be able to see it. When the caster transfers his or her soul upon casting, the caster's body is, as near as anyone can tell, dead, but does not undergo decay as a normal dead body would.

Possession of a creature by means of this spell is blocked by protection from evil or a similar ward. The subject is allowed a save vs. Spells to resist. Failure to take over the host leaves the caster's life force in the magic jar, and that target creature is immune to further attempts for the duration of the spell.

If the caster is successful, his or her life force occupies the host body, and the host’s life force is imprisoned in the magic jar. The caster keeps his or her Intelligence, Wisdom, Charisma, level, class, attack bonus, saving throws, and mental abilities (including spellcasting ability). The body retains its Strength, Dexterity, Constitution, hit points, and natural abilities. A body with extra limbs does not allow the caster to make more attacks than normal. The caster does not have access to any extraordinary or supernatural abilities of the body.

If the caster's spirit is in the magic jar, and the jar is broken (whether by dispel magic or physical damage): If the jar is in range of the caster's body, the caster's spirit returns to its body. Otherwise, the caster's spirit departs (the caster dies). In either case, the spell ends.

If the caster's spirit is driven from the host body by dispel evil: If the magic jar is in range of the host body, the caster's spirit returns to the jar, and the host's spirit returns to its body. The caster will not be able to possess the same host again for the remaining duration of the spell. If the magic jar is not in range of the host body, the caster's spirit departs, the host's spirit is freed from the jar (and departs), and the host's body dies.

If the host's spirit is in the magic jar, and the jar is broken: If the jar is in range of the host's body, the caster's spirit departs, the host's spirit returns to its body, and the spell ends. Otherwise, the host's spirit departs, and the caster's spirit is stranded in the host body. Note here that the spell has not ended. Dispel evil can still be used to drive the caster's spirit from the body, which departs as noted, ending the spell.

In any case where the spell ends with the caster's body unoccupied by a spirit, that body does truly die.