A featureless door is here.
The opening mechanism is hidden and protected with bamboo slivers.
A DC 14 Wisdom (Perception) check detects that one of the wooden planks on the door is more worn than the rest.
A DC 14 Intelligence (Investigation) check reveals that this piece of wood can be tilted slightly, revealing a mechanical device underneath that looks like it could open the door.
Further investigation requires a DC 18 Intelligence (Investigation) check which reveals a small, spring-loaded device inside full of bamboo slivers.
Operating the device requires a DC 16 Dexterity (Sleight of Hand) check. If gloves are worn, this check is at disadvantage.
If gloves are not worn, when the target tries to open the mechanism, they must make a DC 16 Dexterity saving throw. On a failure, small slivers of bamboo embed themselves underneath the target’s fingernails.
This imparts a disadvantage to all Dexterity-based rolls that require the target’s hands.
This condition can be removed with a DC 15 Intelligence (Medicine) check or any magical healing.
The trap can be disarmed with a DC 18 Dexterity check with thieves’ tools to remove the bamboo from inside. Failure means that some of the bamboo was missed, and the trap acts normally.