When the area of a spell is x-ft. radius emanation from touched creature do you select a point to place the effect? (pg. 175 phb Regardless of the shape of the area, you select the point where the spell originates, ... . The point of origin of a spell is always a grid intersection)
Does this mean that parts of large creatures could be outside the effect of such spells even if they are centred on them?
Does this mean that parts of large creatures could be outside the effect of such spells even if they are centred on them?