Phoenix Logs/Forerunner/Aggressor Sentinel


 * Forerunner sentinels that can be called in by Anders to cause area denial.


 * Though their primary purpose is to maintain, repair and protect the Ark, these
 * Forerunner Sentinels can be summoned by professor Anders, who has found a
 * way to deploy them in the service of the UNSC. Once called, the Sentinels
 * swarm into a targeted location and attack any hostiles in the area with lasers
 * beams, remaining and causing area denial for a duration before returning to
 * their jobs on the Ark. Any Sentinels that are destroyed emit an EMP blast,
 * crippling hostile vehicles temporarily.


 * The Sentinels are worker drones with basic AI, created by the Forerunners to
 * safeguard their stations as well as perform repairs and maintenance. There is a
 * large variety of Sentinels in both purpose, size and appearance. There are small
 * Constructor drones used to maintain Forerunner structures, huge Retrievers
 * used for mining and Aggressor drones for attacking any perceived threat. The
 * Sentinels will only attack if they perceive a present threat; otherwise they will
 * happily ignore strangers and carry on with their work.