@JeremyECrawford does a creature have to concentrate after summoning via a Stone of Controlling Earth Elementals?
— David Pozorski (@DavidPozorski) January 13, 2017
The rule on casting a spell from a magic item tells you whether you need to concentrate (DMG, 141). #DnD https://t.co/sOHjsz4scU
— Jeremy Crawford (@JeremyECrawford) January 14, 2017