In my own campaign, players can only polymorph others into beasts they have seen. As such, most exotic creatures, such as T-rexes, giant apes, and mammoths, are off the table.This is for two reasons: (1) Balance. These beasts are VERY powerful. (2) Genre. I play traditional fantasy, and these beasts don't really exist in my world.
I'm curious, though, how other tables handle polymorph and exotic creatures.
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