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The Protector is a Covenant machine similar in design and purpose to the Forerunner Sentinels, from which they were likely reverse-engineered. Upgrading the Prophet of Regret with Ancestral Perversion in the game Halo Wars will equip him with two of these guardians for his personal protection. Like the Sentinels, they have a beam weapon, it is coloured blue, similiar to the Sentinel Major, but fires a single pulse beam similiar to the Hunters Assault Cannon from Halo: Combat Evolved, but longer. They are of similar size and shape to the Constructor but slightly bigger. It has several laser guidance systems that scan for any threats.