Does the rule that says to choose a grid intersection apply even when a creature is the point of origin? Makes cones a bit awkward to aim.If a creature is the point of origin for an area of effect, you can ignore the DMG's instruction to choose a grid intersection.
— Jeremy Crawford (@JeremyECrawford) August 15, 2017
Xanathar's Guide will provide more guidance on using areas of effect on a grid.
— Jeremy Crawford (@JeremyECrawford) August 15, 2017