Normally, all areas of effect are four yards tall (see p. B239). If you wish for the area to be taller, this Enhancement may instead be used to double the height for each level so spent. This should be differentiated as Area Effect (Vertical).

To turn the area of effect into a bubble instead of a cylinder, apply the Limitation Bubble for -25% to all levels of Area Effect (horizontal or vertical), using the Limited Enhancements rule (see p. B111). If the ability itself has a built-in area of effect, then apply the Bubble Limitation to it, as well. The default assumption for the Bubble limitation is that the bubble is that the center of the bubble is the point that;s been targeted by the area of effect.