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There are several spells that require the target to be "humanoid" such as Hold Person, Dominate Person, etc.

However, if the target is Polymorphed after that spell has been successful, then what happens?

Does the change in form to Beast end the spell effects? Does it suppress the spell until the correct form returns? Does it do something else?

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The spells end.

From this answer about dominate beast (quite the opposite of yours), quoting Sage Advice:

In #DnD, the exceptional trumps the general. (No longer being a valid target trumps condition carryover.)

Directly from that answer (which is quite complete):

Dominate Person requires a humanoid target. All official PC races are humanoid, so while the druid is in its normal form it can be targeted and charmed by a Dominate Person spell. If the druid wildshapes into a beast, its type changes to match that beast. So, the druid is no longer a humanoid, the target of Dominate Person is invalid, and the spell ends. In this way, it works in reverse of the Dominate Beast spell.

Dominate Monster works on any creature. Whether in beast form, humanoid form, or even in a Circle of the Moon druid's elemental form, the druid is still a creature. Thus, even going in and out of wild shape won't make the druid an invalid target. Since the target is still valid, the Dominate Monster spell will still have full effect, even if the druid wild shapes.

So, taking your example, let's assume your poor low-HP friendly Bard is being Dominated by some arcane evil Wizard that has acquired some nasty spell-immunity shields. Your friendly Wizard can cast Polimorph or True Polimorph to turn your ally into a T-Rex, which breaks the Dominate Person (as the Bard is now a Beast, and not a Humanoid), and also lets your friendly Bard go on some sort of raging bloody rampage.

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  • \$\begingroup\$ It might be useful to include in this answer a similar example of your own creation of a creature being able to end prematurely Spell A by casting Spell B because the creature's no longer a valid target for Spell A. (This sort of a spell is constantly checking if its target is valid and is automatically dispelled if the target subsequently becomes invalid is, so far as I'm aware, new to this edition and may be a point of interest for those coming to the game from, for example, 3.5e where no such rule exists.) \$\endgroup\$ – Hey I Can Chan Jul 19 '17 at 16:19
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No

If the condition/effects imposed by a spell is only valid for a given creature type, the spell effect says so. This is often different (and more general) than the targeting requirement.

This has been clarified in a recent Sage Advice Q&A:

Does Charm Person ends if polymorph is cast on the charmed humanoid, changing its type to beast?

Mike Mearls: nope, restriction applies to targeting - sticks after successful cast #wotcstaff

Spell descriptions state the conditions that will end the spell, and changing form to another type is typically not one of the conditions.

Targeting and Conditions can (often do) have different type requirements

Consider the description of the Dominate Person. (PH 235) It states “You attempt to beguile a humanoid” but then the subsequent effects of the spell refer to the target as “the creature.”

Once the target is under the influence of the spell, they are dominated as long a they remain a creature (and no other condition occurs that would explicitly end the spell).

Beast spells typically do end when the target changes type

Contrast this with the effect of the spell Dominate Beast — its spell effect refers to the target as “beast” throughout: not just “You attempt to beguile a beast” but then continuing “while the beast is charmed.” In this case, the spell effect designates the charmed condition, not just the target, relies upon the creature type being a beast.

Charming spells in the PH that target beasts (e.g., Animal Friendship, Dominate Beast) consistently refer to the target as “the beast” in the spell effect, while spells that target humanoids (e.g., Charm Person, Dominate Person) refer to the target as “humanoid” only during the targeting, and then refer to the target as “the creature” and/or “that target.”

Mearls tweet is a clarification, not a contradiction, of Crawford’s

There is no contradiction between Mearls’ tweet that Charm Person would persist, and Crawford’s tweet the Dominate Beast would not. Dominate Beast works “while the beast is charmed” (PH 235) and Charm Person affects “the charmed creature.” (PH 221)

For any specific spell, simply check whether the wording of the spell effect changes from the specific creature type to “creature” when it transitions from discussing targeting to delineating the effects and condition imposed, to see if the condition can be dodged by changing your creature type.

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  • \$\begingroup\$ I can see it working that way as well and given the ambiguous wording I think it's more of a table ruling. But in terms of "official", Crawford is the only voice. And mearls' contradictory tweet doesn't override Crawford's because of that. \$\endgroup\$ – NautArch Sep 30 '17 at 23:00
  • \$\begingroup\$ @NautArch, thanks for feedback. I’ve clarified. There’s no contradiction between Crawford’s tweet and Mearls’. Dominate Beast would end, but Dominate Person would not. \$\endgroup\$ – Tim Grant Sep 30 '17 at 23:28
  • \$\begingroup\$ I'm not sure I can totally parse the difference between Target and then the descriptor of "creature" in the spell after that. I understand the semantics, but my gut feeling is that "creature" is just a generic term that doesn't override the original targeting requirements. \$\endgroup\$ – NautArch Oct 2 '17 at 13:13
  • \$\begingroup\$ Thanks for the additional feedback @NautArch. As my understanding of these rules simply jibed with Crawford’s tweet and then Mearls’, it was hard to see where folks were going another way. \$\endgroup\$ – Tim Grant Oct 3 '17 at 1:53

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