Dune Trap Javelin

Weapon (javelin), uncommon

When thrown at a location of sand or dirt (ranged weapon attack against AC 5) this javelin creates a 10-foot-by-10-foot hole with a depth of 30 feet. Any creature standing where the pit is conjured must make a DC 13 Dexterity saving throw to jump to safety in the nearest open space. Creatures who fall into the pit take falling damage as normal.

The pit’s shifting walls have a Dexterity (Athletics) DC of 15 to climb.

Ground matter under the javelin is shunted into an extra-dimensional space and slowly seeps back in, causing the base of the pit to rise 5 feet per round until it reaches the surface. The javelin is consumed after use.