L1. Turret Cavern

This natural cavern is reinforced by support beams across its fifty-foot length. A smooth pillar of stone rises in the center of the cave to a height of eight feet, nearly touching the ten-foot-high ceiling. The tunnel continues beyond the cavern, curving abruptly to the west and out of sight.

Any character with a passive Wisdom (Perception) score of 16 or higher, or who succeeds on a DC 16 Wisdom (Perception) check, notices that a hand crossbow is mounted to the top of the stone pillar. This clockwork crossbow remains inert unless Stahlmast is aware of the characters, in which case it attacks the nearest creature within 30 feet of it each round. The crossbow is +5 to hit and deals 3 (1d6) piercing damage on a hit. If a 1 or 2 is rolled for the crossbow’s attack roll, it breaks and no longer functions.
The crossbow turret is Large object with AC 17, 15 hit points, and immunity to poison and psychic damage.

Parent Plot

3. Stahlmast’s Lair