so can you like ... turn the village into Carrion Beetle and when they eventually run out of THP just turn them back again ... even without line of sight?

so one action for 127 thp repeatable, for every targets if you fancy it, every round for 24 hour

meanwhile powerword fortify is one spell rank lower and only give 120 THP to ONE individual

This isn't a concentration spell in the PHB.

Why doesn't this show up for 2024 bards under Level 10: Magical Secrets?

UPDATE: Tsunami, which is another level 8 druid-only spell does show up correctly in the character builder, but this does not.

Quote from Axoloot >>

so can you like ... turn the village into Carrion Beetle and when they eventually run out of THP just turn them back again ... even without line of sight?

 They have to be willing creatures 

Quote from DnDDetective >>

Quote from Axoloot >>

so can you like ... turn the village into Carrion Beetle and when they eventually run out of THP just turn them back again ... even without line of sight?

 They have to be willing creatures 

 I would be willing if they gave me a platinum piece. 

You only get the THP for the first creature you change into. So, if you change them into a new form, they do not get any more THP.

So it seems the transformation continues even when the Temporary Hit Points given by the spell are reduced to 0, or when the target drops to 0 hit points but is not dead (since  it "lasts for the duration or until the target ends it as a Bonus Action"). However, it's still not clear what happens when the target ends the transformation as a Bonus Action, and the caster uses a Magic action to transform them again. Does the new transformation fail? If not, does it work in the same way as the first transformation (in particular, can the spell be used for "infinite healing"?)?

Quote from PedroStormrage >>

So it seems the transformation continues even when the Temporary Hit Points given by the spell are reduced to 0, or when the target drops to 0 hit points but is not dead (since  it "lasts for the duration or until the target ends it as a Bonus Action"). However, it's still not clear what happens when the target ends the transformation as a Bonus Action, and the caster uses a Magic action to transform them again. Does the new transformation fail? If not, does it work in the same way as the first transformation (in particular, can the spell be used for "infinite healing"?)?

It specifically says the target gains temporary hit points equal to the HP of the first form into which it shape-shifts. It doesn't gain additional temp HP if it's transformed into something else later while the spell is still going on.

Quote from wagnarokkr >>

Quote from PedroStormrage >>

So it seems the transformation continues even when the Temporary Hit Points given by the spell are reduced to 0, or when the target drops to 0 hit points but is not dead (since  it "lasts for the duration or until the target ends it as a Bonus Action"). However, it's still not clear what happens when the target ends the transformation as a Bonus Action, and the caster uses a Magic action to transform them again. Does the new transformation fail? If not, does it work in the same way as the first transformation (in particular, can the spell be used for "infinite healing"?)?

It specifically says the target gains temporary hit points equal to the HP of the first form into which it shape-shifts. It doesn't gain additional temp HP if it's transformed into something else later while the spell is still going on.

Thanks for the reply! I guess the issue is whether "transformation" here is a synonym of "shapeshifting" or not (that's what I was wondering about). If it is, then it can be ended with a Bonus Action, and restarted with a Magic action (thus creating a new transformation/shapeshifting, with a new first form and a new pool of Temporary Hit Points). If it isn't, then the shapeshifting only happens once (when the spell is cast), ensuring the Temporary Hit Points are also gained only once. The thing is the first paragraph says "On later turns, you can take a Magic action to transform the targets again", which makes me think "transformation" and "shapeshifting" are being used as (mechanical) synonyms.

I think it would take a lot of mental gymnastics to read "transformation" and "shapeshifting" to mean two different things in this context.

OK, so standing room events generally allocate about 6 square feet per person; a circle with a radius of 30 feet is 2827 square feet. So we could comfortably transform 471 willing targets into Plesiosauri, who all immediately and simultaneously end their shape change with a bonus action outside of combat, but get to keep 68 temporary hit points for 24 hours.

That's 32,000 additional HP for one spell slot. Or 10,300 additional HP if your GM rules that people can't end the transformation right away, in which case you'd transform them all into Reef Sharks, which are not a different size than an ordinary Medium humanoid - to avoid getting crushed to death immediately.

I don't read anything here that suggests temporary hit points are given more than the one time, at casting. The separate paragraph that describes the temp HP gain means that it is caused by the casting of the spell, not the transformation. I'm not sure why the shape shifting is linked to the tHP in so many people's minds. 

What might be a matter of interpretation by the GM is whether you can keep the new form after the tHP are expended or whether the spell ends for that target. Straight reading suggests that the target retains the altered form and starts burning through their regular HP or that they choose to end the condition as a bonus action. The wording differs from True Polymorph or Mass Polymorph in that those spells explicitly state that the condition ends when the tHPs run to 0. True Polymorph also explicitly states that damage carries over to HP but the regular rules associated with temporary Hit Points make damage carry over anyway.