Arbat-Elivat-Estoni was an Andalite who appeared in The Arrival, posing as an Intelligence Officer. Arbat was a member of Apex Level Intelligence but retired and became a professor instead. He came out of retirement when he found a student, Estrid-Corill-Darrath, who was capable of creating a virus that was deadly to Yeerks. Arbat engineered and organized a covert mission to Earth in order to use this virus against the Yeerks there.Their team also included Aloth-Attamil-Gahar and Gonrod-Isfall-Sonilli. When they learned that the virus could mutate and kill humans, the Animorphs foiled his plans. Arbat was presumably eaten by a Taxxon. He was the brother of Alloran-Semitur-Corrass.