Homebrew (updated older edition)
3-level Evocation
You create a self-loading, self-aiming turret that occupies a 5 foot hex. The turret is a medium object with hit points equal to five times the spell’s level, an AC of 16, and darkvision out to 60 feet. When you create the turret choose a 60 foot cone emanating from it. Creatures the turret can see that enter the area for the first time on a turn, or start their turn there, must make a Dexterity saving throw or take 10 piercing damage, as the turret fires a bolt in their direction. Once the turret has fired 4 times, the spell ends, and the turret becomes inanimate.
You can physically reorient or pick up the turret as an action. If you reorient it you can choose a new 60 foot cone emanating from it. If you pick up the turret, you can place it down in a new location and reorient it with the same action.
When you cast this spell using a spell slot of 4th-level or higher, the number of times the turret can fire increases by 2 for each spell level above 3rd.
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