Draconic Reservoir

Source draconic reservoir

The amount of energy damage the spell absorbs increases to 10 points per caster level (maximum 100 points). The energy damage from the weapons improves as if using a corrosive burst, flaming burst, icy burst, or shocking burst weapon.

Augmented (3rd): If you expend two uses of mythic power, spending a swift action applies the energy damage to any number of creatures the target hits this round, not just the first.