Under the full moon, a werewolf transforms.
Then you secretly transform their wolf form into a wolf; and you extend the duration.
When the moon phase changes, they wait to revert to human... but they're still a wolf. Psyche!
This also works on druids who Wild Shape. When they try to end the Wild Shape, and can't escape their dire wolf form (or whatever), it's pitiful but kinda hilarious.
Alternatively, you Subtle Spell them at JUST the moment their Wild Shape ends, so as they're reverting from bear form back into a human, you poly them into a bear cub. The most confused, distressed bear cub ever.
With True Polymorph, when a doppelganger shapeshifts into a human, you can secretly polymorph them into that human. When they corner their target and are about to do the demoralizing reveal:
"For the last three days, you thought I was your wife! Hah, behold my true form!
(nothing happens)
Hunh? THIS CANNOT BE!"
A priceless moment!
Then you secretly transform their wolf form into a wolf; and you extend the duration.
When the moon phase changes, they wait to revert to human... but they're still a wolf. Psyche!
This also works on druids who Wild Shape. When they try to end the Wild Shape, and can't escape their dire wolf form (or whatever), it's pitiful but kinda hilarious.
Alternatively, you Subtle Spell them at JUST the moment their Wild Shape ends, so as they're reverting from bear form back into a human, you poly them into a bear cub. The most confused, distressed bear cub ever.
With True Polymorph, when a doppelganger shapeshifts into a human, you can secretly polymorph them into that human. When they corner their target and are about to do the demoralizing reveal:
"For the last three days, you thought I was your wife! Hah, behold my true form!
(nothing happens)
Hunh? THIS CANNOT BE!"
A priceless moment!