D&D 5E 0 Hit Points and Polymorph

[Li Shenron]

I would not let it work.

It doesn't work it has received an errata.

Polymorph (p. 266). This spell can’t affect a target that has 0 hit points.

Good to know!

 

[Uller]

Without the errata I'd have allowed it with the caveat that if there is spill over damage after the new form hits 0hp it will result in a death save failure. The polymorphed character would no nger be unconscious or dying since those are a result of being at 0hp, which they no longer are. But when their new form reverts they will again be at 0hp, unconscious and dying.

It's a fourth level spell. It ought to be powerful and versatile but with potential risks. I don't see a downside.

My group has no cleric. They do have a paladin. At 9th level they frequently find themselves in need of a healer. Polymorph serves as a nice filler but definitely has its costs (4th level concentration spell). It is usually either the monk or the paladin that is T-rexified so they can't use their other kewl abilities.

Here is a question: can you polymorph a petrified character? I'd say sure...they remain petrified...but might be handy for moving a petrified ally to safety.

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[Saeviomagy]

I would say it works fine. I'd even allow temporary hit point spells to revive characters. I don't see any benefit to keeping a player unconscious just because one specific category of spell (hit point restoration) is not currently available. Especially since the alternatives have significant risks and drawbacks.

I would apply the same logic to other form-altering conditions that require specific magic to cure such as petrification: polymorph can give you temporary respite.