Basically, you place a block (pink?) and it shoot out a pillar of lava two blocks tall and one block wide in the direction you are facing. Every 3 blocks it travels, it widens by 2. It destroys all blocks excluding metal in its path. After it travels 9 blocks it dies out. There could be an upgrade to make it wider, melt metal, and an upgrade to make it travel farther. Some of you may say this is similar to shotgun, but the purpose of this is to be used in bigger fights or to drive people back. Also it is two blocks high, so you can't jump it, forcing you to run. The price should be around 50 points? This is intended to be a "heavy" weapon.