Ball Bearings


A curved staircase, without handrails, leads upwards.

Mechanical Trap

A pressure plate is on a stair near the top. When it is activated, thousands of ball bearings are released at the top that traverse the length of the stairway.

A DC 10 Wisdom (Perception) check shows that the staircase has a slight “U” shape. This allows the ball bearings to travel down the staircase and keep most of them from falling off the side.

A DC 14 Wisdom (Perception) check reveals a small outline that creates a 1 inch border on a stair near the top. This is the pressure plate. This stair is 40′ up the 50′ tall stairway.

When the plate is stepped on, thousands of ball bearings cascade down the stairs. Creatures on the stairs must make a DC 14 Dexterity saving throw or fall off the stairs, taking 1d6 falling damage for every 10′ they are up the staircase.

The pressure plate can be disarmed with a DC 12 Dexterity check with thieves’ tools. It can also be bypassed by stepping around it. This requires a successful DC 5 Dexterity (Acrobatics) check. Failure means the target falls, taking 4d6 falling damage.


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

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