Kick a boulder up out of the ground then throw it in a line. It deals X-Y earth damage to anything along the path. Creates ooze when it impacts the environment, otherwise continues forever.
Will light on fire and do extra fire damage if it passes over a source of fire or through someone who is burning. It will then set things on fire itself, including the pool of ooze it creates.
The Boulder Dash skillbook is not sold by any merchant. It has to be crafted as it exists in game only in scroll form.
With Crafting level 3, it's quite easy to craft Boulder Dash scroll. Don't waste your time on looking for it with vendors.
Not avalable in Enhanced Edition.