Can you use Shapechange again after dropping to 0 HP?
This might sound strange, but I belive that, according to RAW, you can keep using Shapechange even after getting dropped out of the previous form due to taking damage.
Specifically, the sequence of events I am thinking about goes like this:
- having X HP in your base form, use Shapechange to assume a form with Y HP
- take at least Y points of damage, but less than X+Y
- turn back into your base form†
- make your con save to keep concentrating on Shapechange - nothing in the spell says that it ends upon dropping to 0HP!
- You are now in your base form, with a nonzero amount of HP left - let's call it X' - and still have Shapchange up
- use your action to assume any new form, with the only restriction being that the new form's HP cap out at X'
I believe this last bullet point to be a valid option due to this part of the spell's description:
During this spell's duration, you can use your action to assume a different form following the same restrictions and rules for the original form, with one exception: if your new form has more hit points than your current one, your hit points remain at their current value.
This says nothing about the last form you assumed using the spell - it's your current form whose HP are relevant.
While I believe this to be an obvious oversight in the spell's description - just like the fact that it doesn't actually flat out say that you turn back upon being reduced to 0 HP - I think that, according to Rules As Written, this is how the spell works.
Did I miss something or am I reading this correctly?
† This is never explicitly stated to happen, but can reasonably be inferred from this paragraph:
When you revert to your normal form, you return to the number of hit points you had before you transformed. If you revert as a result of dropping to 0 hit points, any excess damage carries over to your normal form. As long as the excess damage doesn't reduce your normal form to 0 hitpoints, you aren't knocked unconscious.