I was thinking of Focus being the base ability truth be told. What I'd propose is something rather basic, like adding an additional 100 potency to your next Ruin spell, plus the current MP boost you already get from the current ED. This would then diverge via a trait gained at 30, allowing it to affect the next three Ruin spells for SMN, and allowing SCH to instead add a separate 100 flat healing potency to Physick or Adlo, without affecting the shield potency of the latter at all. It could later be improved to affect AoE spells too, possibly, though I'm hesitant to do that on either class given their AoE damage is already fine as it is. It could, however, add more healing potency to Succor in a similar manner. Just boosting the flat heal and not the shield. I'm just reluctant to even do that without a nerf to Indom itself.