Bag of Giant's Stones

This Non descript pouch contains 2d4+2 stones. The stones are about 1 1/2 inches in diameter each. When thrown or launched from a sling, the stones expand in size to the size of a boulder thrown by a Stone Giant. The stones have a range of 60/240 when thrown and 120/240 when launched from a sling. The stones have a +9 attack bonus and deal 4d10+6 bludgeoning damage. If the target is a creature, and is hit, it must make a DC17 strength check or be knocked prone.

Notes: Damage: Bludgeoning, Prone