In a mission, multiple Devastras are fired upon to target the Library on Juno and the mission requires for the Elsior and the Angel Wing to destroy the missiles before they reach the flank and destroy the Library.
While the Devastra themselves are missiles, they are armed with an impressive amount of weaponry that allows them to shoot down targets that impede their bee-line aim toward their target. To make matters difficult, they are understandably well-guarded by the other Val-Fasq ships. It is recommended to clear out the other ships before engaging on the missiles. However, this should be done in a timely manner as they can receive an above-average amount of punishment before being destroyed.