Aggressor Sentinels are Forerunner drones designed to operate in both security and maintenance roles. Each installation has its own unique variation of Aggressor Sentinel, though they all share the same methods of operation and structural design. All known variants of Aggressor Sentinel are equipped with a powerful sterilization beam weapon and energy shields for protection. While Aggressor Sentinels are most well-known for their task of containing and neutralizing Flood outbreaks, they will respond violently to any sufficiently hostile presence, as well as assist Constructor Sentinels in repair operations.