Efil Sennol was a Nautolan Jedi born in 5 ABY. After becoming a member of the Jedi Order, he was assigned to be the apprentice of fellow Jedi Brenge Solnon. He eventually became a part of Nerd Squadron and assumed the title of Nerd Three. He was instrumental in the War against Darth Pathos, as he flew with the squadron, Pathos' main opposition, during the war. He also participated in many missions with Brenge's group and the Jedi Order.