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WhosDaDungeonMaster
Guest
Polymorph in my opinion is a save or die spell. The PCs will polymorph a powerful foe into a slug or something, then cram the body into a small space, like a crevice in a rock wall, and end the spell and the expanding body instantly crushes the monster into paste.
I just read up on Polymorph since it keeps popping up in the thread. First, I would change it to a Constitution or even Charisma save, not Wisdom. Also, as many spells have done in the past, as DM I would rule that a polymorph creature returning to natural form in a space insufficient for its size appears in the closest unoccupied space available that is sufficient for its size. That would stop such tactics.
Another option is change the CR options (the creature must be changed into an equivalent CR or less) to sometime like "the creature must be changed into a CR between one-half its original CR to its original CR". Thus, something with CR of 18, could only be polymorphed into a CR 9 to CR 18.
I don't know, others would have more experience with it in game, but it seems like changes along those lines would stop the abuse of polymorph.