The graser torpedo was an advanced projectile weapon developed by the Mesan Alignment Navy. It was essentially an autonomous vessel with a single-shot cruiser graser, vaguely similar to a missile in functionality but creating a more powerful beam that lasted three seconds instead of five milliseconds. Using its own version of the spider drive, it was a large and cumbersome weapon, with the same trilateral symmetry as the Shark-class pod-laying strike ships which were used to launch it, as well as advanced electronic systems for covert coordination. (HH12ch.28)
Graser torpedoes first saw action during Operation Oyster Bay in 1922 PD, when they where used to destroy Manticoran and Grayson orbital hardware. (HH12)