@JeremyECrawford does the Artificer Mech Servant, and Ranger Companion level up when you do? And if so, how?
— Colin Beaumont (@Comieb) February 23, 2017
If your companion increases in power as you do, the feature that gave you the companion would tell you so and describe how. #DnD https://t.co/OlLsffgwmh
— Jeremy Crawford (@JeremyECrawford) February 23, 2017