Falling Net Trap

Tool Varies

Simple trap (level 1–4, dangerous threat)

A falling net from the ceiling of the dungeon or the canopy of the trees can spell disaster for a party who is already being followed, or even worse, being ambushed.

Trigger. A tripwire strung across a hallway is rigged to a large net. If the tripwire is broken, the net falls on intruders. An iron bell is also rigged to the tripwire. It rings when the trap activates, alerting nearby guards.
Effect. A net covering a 10-foot-by-10-foot area centered on the tripwire falls to the floor as a bell rings. Any creature fully within this area must succeed on a DC 15 Dexterity saving throw or be restrained. A creature can use its action to make a DC 10 Strength check to try to free itself or another creature in the net. Dealing 5 slashing damage to the net (AC 10) also frees a creature without harming the creature.
Countermeasures. A DC 15 Wisdom (Perception) check reveals the tripwire and the net. A DC 15 Dexterity check made with thieves’ tools disables the tripwire without dropping the net or ringing the bell; failing the check causes the trap to activate.