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Errata found on this page
[New] True Polymorph (p.283).This spell can’t affect a target that has 0 hit points. In the second sentence, “the creature into an object” is now “the creature into a nonmagical object.” In the “Creature into Object” subsection (page 284), the following text is appended to the first sentence: “, as long as the object’s size is no larger than the creature’s size.”