Thri-Kreen Weapon Master

You have utterly mastered the weapons of the mantid warriors of the endless sea of sand, the Thri-Kreen.  

You have perfectly mastered the balance and fighting style of the gythka.  Due to you being so accustomed to their balance, gythkas have the light property when wielded by you and the second attack no longer uses a bonus action.  When you are wielding two gythkas, and you make an attack with one of them, you can choose to not take the second attack with the first gythka and instead use a bonus action and make a normal attack with the second one.  You cannot make a second attack with the second gythka when using this feature.  

Chatkchas now return to you whether you hit or miss.  A natural one will still cause them not to return, however.