Bag of Astrum Powder

This small bag is filled with sparkling powder, twinkling like the stars. The bag is filled with enough powder for 2d4+2 uses, each use having enough powder to cover a 5-foot x 5-foot space.

When Astrum Powder is spread on an object or area, that object or area becomes passable for 1 minute. Creatures and other objects can pass through it as if it were difficult terrain. Creatures cannot see through passable objects or areas unless they have truesight.

When Astrum Powder is spread on a creature that is intangible, ethereal, or otherwise incorporeal, they must succeed on a DC 15 Wisdom saving throw or lose that feature for 1 minute and become corporeal. If the creature is not intangible or incorporeal, they and any worn equipment becomes passable for 1 minute.

While passable, a creature must use half of their movement speed to remain level or otherwise begin falling into the floor. They otherwise cannot interact with the world around them, and vice versa. If a passable creature is inside an object when the effect ends, they take 3d10 force damage and are shunted to the nearest open space. If they are inside another creature, both creatures take the damage.