How does Polymorph interact with the Steel Defender since it doesn’t have a CR rating. Sinse it effectively levels up with it’s master it use the Artificer’s level to determine what it can turn into, be turned into CR 0 beasts or is it unaffected? The stat block for the SD on beyond (which I'm not sure is represented in an actual book) gives a CR of 0 for it. pic.twitter.com/9hHQT0wgF6
— Dave Williams (@DaveWil33) April 15, 2020
The Steel Defender doesn't have a CR. Beyond is incorrect on this point.
— Jeremy Crawford (@JeremyECrawford) April 15, 2020