Antimagic Field, True Polymorph, Magic Jar, Clone, and Other Ambiguous Interactions and Edge Cases

In this case, the Conjured Elemental would die at the end of the time specified by the spell. Alternatively, it could be banished before then, but Dispel Magic would have no effect on it because the original spell ended when concentration ended.

Imagine that when you conjure an Elemental using the Conjure Elemental Spell, you are using magic to create the Elemental out of available Elemental energy, weaving the threads of material together into elemental life, usually a very short life. At this point, it is no longer magical, it is just an Elemental.

This is very different from how an Elemental summoned using the Summon Elemental spell works. A summoned Elemental disappears if you stop concentrating on the spell. The Elemental in this case is a purely magical manifestation of an Elemental. The spell descriptions for most Summon and Conjure spells do not seem to have any consistency when it comes to naming, and many spells that have Conjure in their name do not function this way either. If a creature would disappear when you stop concentrating on the spell that brought it here, it would also disappear in an Antimagic field. Otherwise, it would not be affected.

Animated Creatures - Undead, such as those animated using the Create Undead spell, do not collapse into a pile of rotten flesh or dusty bones when they enter an Antimagic field. Some of their abilities may be suppressed, but the negative energy that fuels undeath is as mundane as the spark of life that fuels life in a mortal body.

Constructs - A Construct, such as one created using a Manual of Golems, functions normally inside an Antimagic field, while a Construct summoned with a spell like Summon Construct would wink out of existence.

Shapechanging - A Lycanthrope can normally change forms at will, reverting to it's original human form when it dies. This functions normally inside an Antimagic field.

Monks and ki - Monk abilities are fueled by an internal reserve of power called ki. Monks harness the power of ki to create magical effects and exceed the limitations of their physical bodies. Some of their abilities can even disrupt the flow of ki in others.

Since magical effects cannot be created in an Antimagic field, Monk abilities that try to do this are ineffective while inside.

As a rule of thumb, if you have to spend ki to use it, you can't use it inside an Antimagic field.

Do Core Monk Abilities Work inside an Antimagic field?

The sixth level Monk class features Ki Empowered Strikes and Magic Kensei Weapons are examples of ki abilities that allow Monks to exceed the limitations of their physical bodies, allowing them to overcome resistance and immunity to non-magical damage without actually making the attacks magical. These abilities function inside an Antimagic field because the effects that provide these advantages have no ongoing or individual use cost, and cannot be dispelled. They're just a part of the Monk now.

Deflect Missiles - You can use your reaction to deflect missiles, but you cannot spend ki to make an attack with a missile you catch while inside an Antimagic field.

Diamond Soul - You still have proficiency with all saving throws, but you cannot spend ki to reroll while inside an Antimagic field.

Empty Body - is a two part ability. The first part allows you to spend 4 ki points to become Invisible and gain damage resistance for one minute. If this was used, and then the Monk moved into an Antimagic field, the effects would persist for the duration, but the Monk could not activate this ability while inside. This works because the Monk is overcoming the physical limitations of his own body, but he would not be able to spend ki to do this while inside an Antimagic field. The second part says you can spend 8 ki points to cast the Astral Projection spell, which definitely won't work inside an Antimagic field because it specifically prohibits planar travel and teleportation, and at the end of the day it is still a spell that is being cast, so this is a no-go, even if they could spend ki.

Do Monk Subclass Features Work inside an Antimagic field?

None of the abilities of the Way of the Four Elements Monk function while inside an Antimagic field.

Stunning Strike, Touch of the Long Death, Quivering Palm, and Hands of Healing are examples of ki abilities that cost ki and disrupt or correct the flow of ki in another creature, and these do not work inside an Antimagic field.

Shadow Arts have no effect inside an Antimagic field.

Shadow step doesn't work, but Cloak of Shadows does.

None of the abilities of the Way of the Sun Soul Monk function while inside an Antimagic field.

None of the abilities of the Way of the Astral Self Monk function while inside an Antimagic field.

Ascendant Aspect - Blindsight works, but Augment Breath and Explosive Fury do not.

Now that we're getting the hang of this, I'm only going to list examples and specific abilities that I think might not have an obvious answer. You should be able to tell pretty quickly if an ability will work or not inside an Antimagic field. If not, defer to the lists below.

Do Artificer class and subclass abilities work inside an Antimagic field?

The Right Tool for the Job - A tool created this way persists while inside an Antimagic field.

Chemical Mastery - You benefit from the listed resistances and immunities only while inside an Antimagic field.

Battle Ready - Magical weapons become mundane in an Antimagic field, so they do not count as magical while inside.

Battlefist - Your battle fist, or any other magical prosthesis, ceases to function as a magical item, any infusions or bonuses are suppressed, but due to the mechanical nature of the prosthesis, it still functions as a limb, and in the case of the Battlefist, it also still functions as a weapon and as a shield if you are using the Improved Battlefist.

Construct Apotheosis - While inside an Antimagic field, you benefit from the listed resistances and immunities only, .

Do Sorcerer class and subclass abilities work inside an Antimagic field?

Wind Soul - You benefit from the listed immunity, but no magical flying inside an Antimagic field.

Do Paladin class and subclass abilities work inside an Antimagic field?

Do Druid class and subclass abilities work inside an Antimagic field?

Wild Companion - Functions similarly to a familiar.

Do Cleric class and subclass abilities work inside an Antimagic field?

Eyes of the Night - You, and anyone you shared it with, keeps their darkvision, but you cannot share your darkvision while inside an Antimagic field.

Do Bard class and subclass abilities work inside an Antimagic field?

Unbreakable Majesty - Your permanent appearance change persists inside an Antimagic field, but you cannot assume a majestic presence.

Do Warlock class and subclass abilities work inside an Antimagic field?

None of the abilities of the The Archfey Warlock function while inside an Antimagic field.

None of the abilities of the The Great Old One Warlock function while inside an Antimagic field.

Eldritch Invocations - Many do not function inside an Antimagic field, but some do. Anything that lets you cast a spell won't work, and is not included in this list.

Pact Boons - Generally work inside an Antimagic field with a few minor exceptions.

Pact of the Blade - You cannot create a pact weapon as an action while inside an Antimagic field, and you cannot pull a pact weapon from or store a pact weapon in an extradimensional space. You can bring a pact weapon into an Antimagic field and it will function normally.

Pact of the Chain - Your familiar functions the same way as any other familiar inside an Antimagic field.

Pact of the Tome - You cannot cast the cantrips granted to you by your Book of Shadows.

Pact of the Talisman - Functions normally, but you cannot replace your talisman while inside an Antimagic field.

Radiant Soul - You benefit from resistance to radiant damage, but nothing else while inside an Antimagic field.

Bottled Respite - You cannot enter or leave your Vessel while it is inside an Antimagic field, nor can you hear anything from outside, as the extradimensional space is completely cut off. If the vessel is destroyed, the extradimensional space is unaffected, when the Antimagic field effect ends, you exit the vessel, along with anyone and everything that was brought inside. The ceremony to receive a replacement vessel does not work while inside an Antimagic field.

Do Barbarian class and subclass abilities work inside an Antimagic field?

All Barbarian Core, Path of the Berserker, Path Of The Beast, Path of the Battlerager, and Path of Zealot class abilities function normally while inside an Antimagic field.

With the exception of Magic Awareness, Storm Soul, and Totem Spirit, none of the Path of Wild Magic, Path of the Storm Herald, Path of the Ancestral Guardian, or Path of the Totem Warrior features function while inside an Antimagic field.

Do Fighter class and subclass abilities work inside an Antimagic field?

All Fighter Core, Banneret, Battle Master, Cavalier, Champion, and Samurai class abilities function normally while inside an Antimagic field.

None of the Echo Knight, Eldritch Knight, Psi Warrior, or Rune Knight features function while inside an Antimagic field.

Do Ranger class and subclass abilities work inside an Antimagic field?

With the exception of Primeval Awareness and Nature's Veil, all Ranger Core class abilities function normally while inside an Antimagic field.

With the Exception of Otherworldly Glamour, and Planar Warrior, none of the features of the Fey Wanderer, Horizon Walker, and Swarmkeeper Ranger function while inside an Antimagic field.

With the obvious exception of Gloom Stalker Magic, all of the features of the Gloom Stalker, and Hunter Ranger function normally while inside an Antimagic field.

Ranger's Companion - You can't form a bond with a companion while inside an Antimagic field, but once a bond is formed, the companion functions normally.

Primal Companion - Functions similarly to a familiar.

Drake Companion - Functions similarly to a familiar.

Drake’s Breath - While an innate breath weapon functions normally, this ability is fueled by spell slots, so it would not work inside an Antimagic field. The resulting Breath Weapon attack would, however, affect targets inside of an Antimagic field.

Do Wizard class and subclass abilities work inside an Antimagic field?

None of the Wizard Core and Subclass abilities function inside an Antimagic field, with the following exceptions:

At this point, if your original body is either out of range or affected by an Antimagic field, you would die.

If we assume that 'Your body' in the spell text means either 'Your original body' or 'The body your soul is controlling when you cast the spell', if it is the first case, this will not work. You can stop trying to follow the logic of this example now. In the second case, the first casting of Magic Jar either ends when you cast it again, or it does not. If it does end, this will not work. If it does not end, and 'Your body' means 'The body your soul is controlling when you cast the spell', then this does work. See the following examples.

You cast Magic Jar and your soul moves into the Jar. You possess a humanoid, your soul moves into the humanoid's body, and the humanoid's soul moves into the Jar. You cast magic Jar again, and your soul moves into a different Jar. The first casting of Magic Jar ends. The final event triggered by the end of the first spell forces your soul to immediately return to your body. This occurs immediately before your soul moves into the new Jar because the previous spell has to end before the new spell can begin.

So, your original body would still be the same as it was for the first casting. If your original body is more than 100' away when this happens, you die (since there is no other valid version of you when this happens, you are the humanoid when this effect triggers). Even though your body is dead, the magic of the second casting of Magic Jar allows your soul to move into the second Jar, but the creature you were possessing when you cast the spell would die, and then the only remaining viable body would be your original body. If you possessed your original body and cast magic Jar a third time, you would just be back to where you started.

You cast Magic Jar and your soul moves into the Jar. You possess a humanoid, your soul moves into the humanoid's body, and the humanoid's soul moves into the Jar. You cast magic Jar again, and your soul moves into a different Jar. You possess your original body make sure you and the body of the humanoid you had possessed in the first casting are more than 100 feet away from you and either Jar. You have a friend destroy the first Jar, which forces your soul to return to your original body. You're already in your original body, the first instance of Magic Jar has ended, the soul of the humanoid you possessed is dead, and it's body is now your original body for the second casting of Magic Jar.

You bring the Jar and the bodies together and return to the Jar. Your friend destroys the second Jar, and your soul returns to the body of the Humanoid you possessed in the first casting. Now there are no instances of Magic Jar active, and your soul is permanently in the new body. Your old body is still alive, and available as a spare if you need it.

Based on these examples, I hope we can all agree that you can permanently swap bodies with someone using Magic Jar, as long as you can agree that a second casting of the spell does not end the first casting, and that 'your body' refers to the body your soul is occupying when you cast the spell.

Clone - Since we are talking about Magic Jar and body swapping, it feels like an oversight if we didn't talk about this spell in the next breath. This isn't really related to Antimagic field, but if you clone a creature that is being possessed by a different soul using Magic Jar, does the Clone create a duplicate of the possessed body, or of the soul's original body? If the Magic Jar spell ends before the clone is ready, would that soul still be eligible to transfer to the clone? If the soul returns to the original body at any point, does that affect the outcome?

When you cast Clone, you target a creature that is to be cloned.

Clone reads: "This spell grows an inert duplicate of a living creature as a safeguard against death."

Based on this text, the duplicate is based upon the biological creature, irrespective of which soul might be occupying the creature at the time, so it definitely creates a copy of the biological creature. Example: If you cast Clone on a Couatl, the resulting clone would be of a Couatl.

When the cloned creature dies, the Clone spell checks to see if that creature has a soul, and if it does, it allows that soul to transfer into the clone.

Clone reads: "if the original creature dies, its soul transfers to the clone, provided that the soul is free and willing to return."

Magic Jar Reads: "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."

Magic Jar also Reads: "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."

Based on this, the original creature is the biological creature, and the soul is whatever soul happens to be occupying the body of the creature that was cloned.

In the case of Magic Jar, when the cloned creature dies, the Jar must be more than 100 feet away, otherwise the soul will return to the Jar, rendering the clone useless.

If your soul is in the cloned creatures body when it dies, it triggers both of the effects, one for Magic Jar, and one for Clone.

If we follow the rules for resolving simultaneous effects outlined in Xanathar's Guide to Everything, the player chooses the order in which the effects resolve. If the player can choose to resolve the Magic Jar effect first, (Return to your body or die, so you die, but that's ok because you already died), and then the Clone effect (your soul transfers to the clone). This would allow the soul occupying the cloned body at the time of death to transfer into the clone.

Clone reads: "The original creature’s physical remains, if they still exist, become inert"

The original creature in this section of the spell is the biological creature that your soul was possessing by means of the Magic Jar spell when you cast Clone, which means that your original body (the body you cast Magic Jar from), assuming it was cared for, is still alive, and viable, and you could use Magic Jar again to possess it, so you could keep up the appearance that you haven't become something or someone else.

In all reality, you would only need to resort to the Magic Jar\Clone combination if your Dungeon Master disagrees with the fact that a second casting of the Magic Jar spell does not end the first casting, or disagrees with the interpretation that 'your body' refers to the body your soul is occupying when you cast the Magic Jar spell.

In any case, if your DM is still opposed to this idea, you can always just use True Polymorph instead if you want to permanently become something else.