
I believe that a hwacha should do minimal damage to walls, but deal significant damage to other players. Because of this, the hwacha would be best suited to be used as a defensive building rather than offensive. That is to say someone could use the hwacha as a 2nd line offensive building, dealing damage to players after the walls are breached. The hwacha would be able to pepper a large area with its singijeon arrows. The hwacha would require that it be lit to fire off it arrows and can be manned to aim it at its targets. Players must have their perception and marksmanship to 50 to be able to man the hwacha, and must have criminal acts turned on to fire. and can only be loaded with singijeon arrows in order for it to launch the arrows.
To craft the hwacha would require:
30 boards
40 blocks of wood
10 bone glue
5 hardend leather
5 rope
and 10 brimstone
The singijeon would require
1 arrow
5 charcoal/black coal (fuel for rocket)
1 parchment (to wrap the charcoal around the arrow)
and 1 string (to create a fuse)
a singijeon cannot be fired from a bow, it must be used in a hwacha.