When Ineffa is affected by the Carrier Flow Composite effect, she will deal AoE Electro DMG equal to 135% of her ATK to opponents in the current active character’s vicinity after nearby thunderclouds release bursts of lightning at opponents. This DMG is considered Lunar-Charged DMG. The aforementioned effect can trigger once every 3.5s.
Regarding the alternative for Bennet. Xiangiling might be better. Swirl doesn´t scale with ATK and ...