Rockslide Trap
When a pressure plate concealed on the ground registers 20 or more pounds of weight rocks prepared above the path fall in a torrent to crush everything below them.
Fly Away. The use of fly or similar magic triggers a critical success for that adventurer.
Off the Path. Any creature damaged by the Trap. This trap can be detected by a passive Perception of 14 to notice a hidden pressure plate among the variations in natural stone and ash on the ground. If the trap is not detected, it automatically triggers a critical failure.
A thieves’ tools check to wedge something beneath the pressure plate prevents it from activating, it might be carefully avoided with a group Acrobatics check, or jumped over with a group Athletics check (checks to climb along the sheer wall have disadvantage).
Critical Failure: Adventurers take 14 (4d6) bludgeoning damage. Anyone that takes 5 or more damage makes a Dexterity saving throw with disadvantage or gets knocked from the path, falling 6d10 feet before landing on an isolated ledge. Climbing back up requires an Athletics check.
Failure: As a critical failure, but the Dexterity saving throw is not made with disadvantage .
Success: The adventurers avoid or disarm the trap, or activate it from a safe distance.
Critical Success: The adventurers avoid or disarm the trap but have the option to leave it active for someone else to deal with.