The older of the Zovamai brothers, Grus is a loyal covenant soldier and acts in both faith in his leaders and honor to his mentor. As a child, he was the one to protect his younger brother when his father was killed for heresy. He was taken in by  Casan 'Kragum and became his apprentice. He holds great respect for his mentor and family love for his brother. When he learns that his mentor has defected to the humans, it completely ruins him. He is conflicted on killing his old guardian,  and becomes more heartbroken when his brother sides with his mentor. He is caught between a hard decision, choose his loyalty to the covenant or help those he considers close family. 

Grus acts strong and confident in battle and is quick to put down those who oppose him. But when around his brother or mentor, his demeanor is soften and talks in a more caring and curious attitude.