Brother Eye

The Brother Eye is a variable, slightly independent weapon created by the Watchman during the War with the Monster King. Though it's power has greatly diminished in the interval between the First Age and Second Age, it is still capable of tracking targets and firing a highly focused laser, or acting as a rudimentary shield.

The most unique thing about the Brother Eye is it's ability to act independently of it's wielder, capable of following simple commands. In this way it could be seen as an even less sentient Servitor.