Opal of Tunneling

This black opal bead is about the size of a large pearl.

When thrown against a surface, the bead explodes in a red flash and melts a hole into the material, forming a lava tube 10 feet wide and up to 30 feet long. The hot tunnel walls deal 1d6 points of fire damage per round of contact. Edges of the lava tube glow with this heat for 1 minute, after which time the new tunnel is safe for unprotected creatures to enter.

An opal of tunneling works only on rock and similar materials (such as crystal, salt, and so on). It does not damage a living creature, nor does it penetrate wood. However, a creature within the 10-foot-diameter sphere of the bead’s explosion takes 2d6 points of fire damage from the blast.

Prerequisites: Craft Wondrous Item, disintegrate, wall of magma.

Cost to Create: 3,175 gp, 254 XP, 7 days.

Source: Sandstorm, page 134.