You can increase the effect of a spell by +75%.
Alternatively, you may expend a use of mythic power to cast a spell as an empowered spell (gaining only the normal benefits of an empowered spell, rather than the increased benefits outlined above) without preparing it as empowered in advance, taking extra casting time, or increasing the level of spell slot it uses.
Normal: All variable, numeric effects of an empowered spell are increased by half including bonuses to those dice rolls.
Mythic Options: The Missing Core Feats. © 2013, Owen K.C. Stephens; Author: Owen K.C. Stephens