Greater Burrowing Bolt

These arrows have tips grooved like a drill bit and angled fletching, causing them to spin quickly about their shaft when fired. When striking a structure or object of Hardness 14 or less within your first range increment, an activated burrowing bolt tunnels into the surface silently and leaves a hole behind it, burrowing through up to 5 feet of material before magically vanishing.

The bolt can burrow through up to 10 feet of material with Hardness 18 or less.