The Bittersea Deeps

In the deep places of the world, things sleep. Some sleep well, others poorly. Some for now, some forever. Beneath the Bittersea, a vast creature rests almost awake eternally, poisoning the taste of the water for a hundred miles in every direction. Those empowered by the Deeps find that their abilities gain a certain ineluctable force.
Benefit: You gain a +3 bonus to the DCs of all abilities you use. Once per [Encounter], any damage dealt by the next ability you use ignores [Immunity] and cannot be mitigated, reduced, or redirected by other abilities or effects.