Split Shot Power is an Aegis Rank upgrade for the Ion Titan, unlocked at Aegis level 2. When applied, it upgrades the power of the Splitter Rifle's alternate fire mode, which splits its projectile into three or five depending on if Refraction Lens is equipped.
Because of this upgrade and the nerf to the power of Laser Shot in Monarch's Reign, it is recommended to run Refraction Lens on Ion to maximise damage potential of her primary weapon. This larger spread will also allow for better damage output vs. clusters of infantry or groups of Titans, as the wider spread will be able to hit more enemies at once. This strategy can melt through even Sword BlockingRonins or Nuke Titans.