Energy Ray is the initial Overdrive for Valefor, which deals heavy non-elemental damage to all enemies. It is also an enemy ability used by Valefor (but not in the final battle), Pterya, and Dark Valefor, where it still just deals major non-elemental damage to the party. However, in Dark Valefor's case, it deals magical-based damage, making it easier to reduce the damage of the attack. All enemies that can use Energy Ray will do so without needing to have their Overdrive full.
Energy Ray is an enemy ability used by Valefor, which deals major non-elemental damage to the party, albeit less than Energy Blast. Energy Ray can be used at any time without needing the Overdrive meter being full.
Energy Ray is a ground HP Attack for Yuna, obtained initially at the start of the game. It has Ranged High priority, and requires 150 AP to master while needing 30 CP to equip (15 when mastered). Energy Ray is also seen as part of Yuna's EX Burst.