Terestri is said to have been born and raised in a druidic colony located in the Mandehanwei Rainforest . At some point, due to unknown circumstances, he met his older brother, Faelyn. Faelyn took him out of the colony and the two of them traveled together for approximately two years. Allegedly they did not get along at first. They were previously settled in Silene. Terestri would eventually be taken from Silene and kept in an unknown location for nearly a year. After Faelyn willingly succumbed to his cordycepts infection, Terestri was sent to Port Kahale to live with Dahlia's ex-wife and sons.
Terestri was aware that his biological parents intended to kill him as a sacrifice. He once had a brand on the back of his neck. Terestri would be kidnapped and held for nearly a year. When he was released, it was after learning of Faelyn's effective demise, and to be confronted with the massacre of The Seven Wonders.
Terestri was once said to act younger and less mature than he actually is. He is a very intelligent child, grasping the basics of artifice by age ten. Additionally, he is something of a prodigy with wildshape, able to take advanced animal forms and retain them beyond the limit of druidic magic.
Allegedly, Faelyn met Terestri by coincidence. While hiding in the Mandehanwei rainforest, he heard Terestri crying, as Terra knew his parents intended to use him as a form of sacrifice. Against typical judgement, Faelyn halted to speak with him, and then decided to bring Terestri with him after killing his parents.