@JeremyECrawford Can you concentrate on a spell whose active effects are on an other plane of existance? Flaming Sphere from Etherial Plane?
— Manuel (@Asmo1993) March 9, 2017
No general rule prevents you from concentrating on a spell across planar boundaries. #DnD https://t.co/fwUVQX6lHw
— Jeremy Crawford (@JeremyECrawford) March 10, 2017
