Falling Net Trap

Mechanical trap
This trap uses a trip wire to release a Net suspended from the ceiling.
The trip wire is 3 inches off the ground and stretches between two columns or trees. The net is hidden by cobwebs or foliage. The DC to spot the trip wire and net is 10. A successful DC 15 Dexterity Ability Check using Thieves' tools breaks the trip wire harmlessly. A character without thieves' tools can attempt this check with Disadvantage using any edged weapon or edged tool. On a failed check, the trap triggers.
When the trap is triggered, the Net is released, covering a 10-foot-square area. Those in the area are trapped under the net and Restrained, and those that fail a DC 10 Strength Saving Throw are also knocked Prone. A creature can use its Action to make a DC 10 Strength check, freeing itself or another creature within its reach on a success.
The net has AC 10 and 20 Hit Points. Dealing 5 Slashing Damage to the net (AC 10) destroys a 5-foot-square section of it, freeing any creature trapped in that section.