2 Invid using Annihilation Disks
Annihilation Disks were a type of Invid weaponry that produced powerful blasts. During the Invid attack on Tirol, 2 Invid soldiers used Annihilation Disks to burst through a door in an attempt to find the Robotech Masters data on where they send the Protoculture Matrix. (Robotech II: The Sentinels: Departure)