Ray Psynergy series

Ray, Storm Ray, and Destruct Ray are a series of offensive Jupiter Psynergy featured throughout the Golden Sun series. In Golden Sun and Golden Sun: The Lost Age, it is available to the Wind Seer Class series. Hence, Ivan and Sheba can use this series of Psynergy. In Golden Sun: Dark Dawn, the series is removed from the Wind Seer series, instead finding itself in the Beastling class series's arsenal, allowing Sveta to use this series.

Psynergy spells
Ray: "Attack with a magnetic storm.": This costs 6 Psynergy Points, has a base power of 35, and has a range of three targets. An array of thin purple lightning thoroughly damages the enemies. It is available at level 4.

Storm Ray: "Attack with a magnetic storm.": This costs 10 Psynergy Points, has a base power of 65, and has a range of three targets. An array of purple lightning thoroughly damages the enemies. It is available at level 14.

Destruct Ray: "Attack with a magnetic storm.": This costs 21 Psynergy Points, has a base power of 150, and has a range of three targets. An array of thick purple lightning thoroughly damages the enemies. It is available at level 36.

Analysis
While by no means the most powerful Jupiter Psynergy available, all spells within the Ray series are quite PP-efficient, given that hardly any enemies in the late-first game and all of the second game come in groups of more than three.