Fanaelialae
Legend
This seems relevant to a thread about Tome of Beasts:
If the DM buys a new book of monsters or invents a legendary beast for one adventure and the campaign breaks due to Polymorph, I don't think it is the new monster book/new adventure that is at fault. Polymorph could have been written in a way that is fairly balanced--for instance, by making damage carry over to your normal shape, which is how it worked in AD&D--but it was instead written in a way that is ripe for exploitation.
By all means rewrite polymorph if that's what you feel is best. For me, restricting ToB and 5EF content to "with DM approval only" status is a simple and effective solution.
EDIT: For rewriting polymorph, I would start by restricting the CR allowed based on the level of the spell slot used. With only the MM this isn't really an issue because you get polymorph at level 7 but the beasts in the MM top out at CR 8. If you expand outside the MM, it has absurd potential for scaling (up to CR 20).
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