Backstab

Backstab (バックスタブ) is a stand-alone Jupiter Psynergy introduced in Golden Sun: The Lost Age.

Basic Characteristics
Backstab is an offensive, single-target Psynergy that is Attack-dependent, meaning that characters with higher Attack will deal more damage with this Psynergy. In addition, the caster's Jupiter Power and the target's Defense and Jupiter Resistance will all factor into the damage dealt.

Visually, Backstab features the user appearing behind the opponent and performing a standard physical attack. Afterwards, a large cluster of stars fire out of the targeted opponent.

Availability
Backstab is available to the Pierrot class series, an Item-dependent class accessed by equipping a Mysterious Card to the appropriate Adept. Since the Mysterious Card is only found in The Lost Age, Backstab is limited to the eight playable Adepts of that game. Backstab is learned at Level 29, but is not initially available. To obtain Backstab, the Adept in question must be in the Punchinello or Acrobat stages of the class. To reach the Punchinello stage, the Adept must have 6 Djinn, divided equally between the three elements other than the Adept's natural alignment. The Acrobat stage requires 9 Djinn, divided in a similar manner.

Analysis
General: Backstab is equivalent in power to Psynergies like Ragnarok, but will do slightly lower damage in practice due to the Pierrot class's lower Attack. In addition, it is over double the cost of Psynergies of equivalent power. However, Backstab does have the ability to instantly fell a target, which helps to make up the difference. Since most bosses are immune to such effects, however, Backstab's usefulness would be limited to random encounters.