Submerged Walkway


A concrete trench cuts through the moat; the water level is just below the top of the trench.

Mechanical Trap


A pressure plate causes the water to rise, rushing over the top into the sodium-lined trench.

The surface of the trench is slightly waxy. A DC 14 Intelligence (Investigation or Nature) check reveals that the waxy substance is water-soluble and scratches away easily. Scratching the surface reveals a cold, buttery type substance which is identified as sodium with a DC 16 Intelligence (Investigation or Nature) check.  

In the middle of the trench, a DC 13 Wisdom (Perception) check spots a 10’x10′ slight depression in the trench. This is the pressure plate.

When a target steps on the plate, the water level rises a few inches and splashes into the trench. One round later, the waxy substance dissolves. When this happens, all targets within 60′ of the trench take 10d6 fire damage, with a DC 18 Dexterity saving throw halving the damage. The trench also becomes destroyed, leaving everyone in a 20-foot deep moat.

The pressure plate can be jumped over. Or, a target can climb along the outside of it on the top of the narrow wall. This requires a DC 14 Dexterity (Acrobatics) check. On a failure, the target has a 50% chance of falling in the water. If this occurs, water splashes into the trench, causing a small explosion. Any target within 10′ of the falling creature takes 1d6 fire damage, with a DC 12 Dexterity check halving the damage. However, the trench collapses 1d3 rounds later, which sets off the big explosion immediately.

The pressure plate can also be jammed by scraping away the top-coat and jamming it. This requires a successful DC 14 Dexterity check with thieves’ tools and also causes 1d4 poison damage to the target.

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

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