as a dexterity attack at will, you fire a beam of pressurized water in a straight line that spans indefinitely until it hits a solid barrier, functioning as a hitscan projectile , dealing 1d12 ballistic damage, and it will ricochet 1d4 times off of a solid surface into the following with the following priorities

1st. coins or other reflecting units 

2nd. cores, bombs or other explosives

3rd. projectiles

4th. The weak point of a hostile creature 

5th. another solid surface