Radiation Expert
From Starsonata Wiki
Radiation Experts receive +10% Damage to radiation damage and +2% to most stats on slaves. This skill costs 10 skill points per level up to level 20. Its prerequisites are Remote Control and Slave Mastery.
Radiation Experts tend to specialize in capturing ships and/or bases and using slaves. An interesting class to say the least, but it is not recommended for just anyone but for those who know exactly what they're getting themselves into.