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npc_hover_turret is a point entity available in .
It is an enemy cut from the game. It was supposed to look like a Curiosity Core, but has no in-game model. The coded model name is "models/npcs/hover_turret.mdl".
It shoots lasers at you. They act like Discouragement Beams. When they turn yellow, it sees you.
Adding them to the game: See here.