Flint Wheel

A metal hatch with a wheel is in the wall.

Mechanical Trap


The hatch has a small gas jet and flint installed on the inside of the hatch.

A  DC 10 Intelligence (Investigation) reveals that the stone around the hatch is made from flint.

When the wheel is turned 8 times, the hatch opens. While turning the wheel, a DC 16 Wisdom (Perception) check detects the faint smell of gas coming from the hatch.

When the hatch is opened, it scrapes against the flint, causing a spark that ignites the gas. All targets within 30′ of the hatch take 6d6 fire damage, with a DC 14 Dexterity saving throw halving the damage. Also, the first target in a 20′ line in front of the hatch must also make a DC 16 Dexterity saving throw or take 4d6 bludgeoning damage from the hatch, as it is blown off.

The gas valve can be disabled by pinching off the feed line inside the wheel. This requires a DC 16 Dexterity check with thieves’ tools. Failure causes the line to rupture. This adds 2d6 to the fire damage when the hatch is opened.

The hatch opening around the sides can also be carefully covered with thin cloth or a similar substance with a successful DC 18 Dexterity check with thieves’ tools. Failure results in the trap going off if the hatch is opened.

Categories: 5e, Dungeons and Dragons, mechanical | Tags: , | Leave a comment

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