What would happen if a creature who was polymorphed was affected by, for example, a neogi's Enslave ability, when the spell ended? Would the creature no longer be enslaved, since both its mental ability scores are different, or would the mind control still be in effect?
What happens when a Polymorphed creature who was mind-controlled reverts to its original form?
\$\begingroup\$ Hi RandalCandle, welcome to rpg.se! Take the tour when you get a chance and visit the help center or ask here in the comments if you need more information. This is a nice first question. Thanks for participating and happy gaming! \$\endgroup\$– linksassin ♦Sep 9, 2021 at 8:14
\$\begingroup\$ This is perhaps somewhat related: rpg.stackexchange.com/questions/181999/… \$\endgroup\$– RHSSep 9, 2021 at 12:37
\$\begingroup\$ Very related on Does exhaustion affect a creature after it is polymorphed? \$\endgroup\$– NautArchSep 15, 2021 at 17:18
The creature would still be under the effect.
Effects such as a neogi's Enslave action, like conditions, are not part of a creature's game statistics. Therefore, despite what you might expect, the changing of a creature's mental ability scores has no bearing on (ending) such an effect. Consider that the target of the polymorph spell retains its alignment and personality.