This should have a note in the "Available For" field that Druids can take it if using the Tasha's options.

It says Devotion Paladins at level 15 are always under the effects of this spell. Does that mean they have to choose a creature to be resistant to every 10 minutes or be protected against them all?

Quote from InsertGenericUsernameHere >>

It says Devotion Paladins at level 15 are always under the effects of this spell. Does that mean they have to choose a creature to be resistant to every 10 minutes or be protected against them all?

 
I might be late on answering this for you, but the Devotion Paladin would be protected against all types mentioned in the spell constantly when hitting level 15.

The wording of the spell says "you touch a willing creature" who would be protected against all those types.

The Oath of Devotion feature just skips over picking who benefits from the spell. Otherwise, the rest of the spell is the same. No need to specify what creature type to begin with. Hope this helps!

Would this work on the bodies of people affected by Magic Jar?  It would seem that the target being referenced to in the text is, in most cases of possession,  still there but shunted off to the side. In Magic Jar, however, there is nobody left in the body with volition but the possessor - so it would seem that this wouldn't allow the "target's" soul to get another save since the target soul could possibly even be on another plane, yes?

Quote from Deutreshi >>

Would this work on the bodies of people affected by Magic Jar?  It would seem that the target being referenced to in the text is, in most cases of possession,  still there but shunted off to the side. In Magic Jar, however, there is nobody left in the body with volition but the possessor - so it would seem that this wouldn't allow the "target's" soul to get another save since the target soul could possibly even be on another plane, yes?

 The Magic Jar spell already stated where Protection from Evil and Good can protect someone against being possessed. Once a target is possessed, their soul is now in the Jar, and there are no future saves, so Protection cast afterwards would have no affect.

If there's no price listed, the components are assuming to be in a component pouch

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TcoE adds this spell to druid, but it is unavailable in any of the lists with all content enabled, book purchased, and made available in campaign.

Are changelings considered fey, and would this spell effect them?

Quote from shyuchi >>

TcoE adds this spell to druid, but it is unavailable in any of the lists with all content enabled, book purchased, and made available in campaign.

In the Character Builder for your druid, go to "2. Class".  Between "Class Features" and "Spells", you should now see an "Optional Feature Manager", and you can check off Additional Spells, as well as Wild Companion and Cantrip Versatility.  Additional Spells will get you this spell and the others.

Darn it!  This and magic circle have no effect against saving throws.  Then again, magic circle requires no concentration, so you can combine with circle of power at higher levels.  

But that's only if you're Guarding yourself.  If I'm guarding you it should be Guardimas ... ;-)

If I remember correctly, Druids can also get Protection from Evil and Good. Feel free to correct me if I’m wrong, though.

Our game is currently interpreting this spell in relation to a sentient magic item. 

item is not a creature, nor necessarily of those types, so can it still possess.

no verdict yet, but feels like a RAW vs RAI scenario.

Quote from DM_eMDeeK >>

Our game is currently interpreting this spell in relation to a sentient magic item. 

item is not a creature, nor necessarily of those types, so can it still possess.

no verdict yet, but feels like a RAW vs RAI scenario.

 As far as I know, magic items aren't made sentient solely by the will of the crafter.  There is a being in the item.  If that being is a aberration, celestial, elemental, fey, fiend, or undead, then this spell should work.  If not, then the spell has no effect.  Which doesn't really solve the problem, but should at least narrow down the search for a answer.

I think that this spell should have some kind of benefit for upcasting

“Available For”: add Monster Slayer ranger 

Mostly because many encounters consist entirely of creatures that this stat guards against and turning off fear, charm and giving disadvantage on all attacks against the party with a single spell is super busted. As is it’s a great option but you have to think carefully who is most in need of the protection.

Just call it 'protection from extraplanar beings'.  Yeah, some undead aren't exactly otherwordly, but there's an extraplanar force animating them.

Disagree. If there is no cost the materials aren’t needed.

“A spellcaster must have a hand free to access a spell's material components -- or to hold a spellcasting focus…”