Stone Drill

The stone drill spell is a form of the dig spell that allows the caster to bore tunnels through both hard and soft rock. It cannot move earth, sand, mud or softer materials, which will collapse. The spell drills through stone at a rate of 1 foot per round, removing about 20 cubic feet of material per round. The removed material is crushed into fine gravel as well.

Tunnels: Tunneling is possible with stone drill as long as there is enough space available for the removed material to pile up (other spells or hired help are needed to clean up the debris). The chance for a tunnel to collapse is 10%, checked for each 5-foot section unless the area is supported or braced.

Pits: A tunnel can be drilled vertically, but a pit, similar to one made by the dig spell, has a 5% chance per S-foot section of collapsing in on itself. The spell is not fast enough to dig pits in front of creatures moving toward the caster. However, creatures within 10 feet of the drilling area will be pelted by gravel and stones cast out by the stone drill, taking 2d4 points of damage. A saving throw vs. spell is allowed for half damage. Creatures of earth and rock are unaffected.

If used in combat against creatures of earth and rock, the caster must attack with the spell for two consecutive rounds before inflicting damage, due to the slow speed of the drilling. The spell inflicts 5d6 points of damage on creatures of earth and rock. A successful saving throw vs. spell reduces this damage by half.

The material components are a twisted bar of iron or steel and 500 gp worth of diamond chips. These are expended in the casting.