This weapon is only powered by a special crystal called surgestone. To use this, the user must place a crystal of 10 cm long and 5 cm wide (costing around 1000 gp) into the hatch, and the weapon will begin to charge. The beam fires 3 shots before the crystal loses it's energy. The beam is a plus 2 to hit, and deals 6d10 damage (I don't know what to call it, it destroys atoms), with 5 damage subtracted for each number of the target's armor class above 18 (indestructible armor blocks the shot). Any armor shot at save armor made of indestructible materials gets a 20 cm hole directly through it, destroying the matter of the armor.
Optional Rule (Does not work on highly regenerative creatures or shapeless monsters): Enemies hit by this attack must make a Constitution save DC 20 +1 for every 10 points of damage. On a failure, the enemy has a 20 cm hole burnt through it and is reduced to 0 hp.
This beam melts through almost any material (at the DM's discretion).
Feel free to edit anything for your campaign. I feel this weapon may be a bit game-breaking or overpowered, so change how you see fit.
There are no more than 5 of these existing. They are made of an almost indestructible metal (AC 28, 180 HP) of unknown origin.
Notes: DO NOT GIVE PLAYERS TOO MANY CRYSTALS., Damage