Control Skills
From Starsonata Wiki
Control Skills:
These skills are trained in Lagrange at the hidden base. Each one costs skill points equal to the level of the skill desired per rank, and is capped at 25 ranks.
There is one for each of the seven damage types, and they are exclusive to the Resistance Skills, so pick carefully because for each damage type you can either have a resist or a control.
These skills add 1 damage per projectile to all weapons that match the damage type. These skills are useful for multiprojectile weapons or weapons that have fast rate of fire.