Rysangel
Sling Staff, the preferred weapon of the Kendar but it should have metal ferrels on the top and bottom, iron and silver, for extra close in damage. But I would also have made second smaller back up weapon, a Small Catapult with hidden blade in the handle. Also maybe a Bamboo Baton that the Rock can be attached to as a weighted Baton Club.
I was thinking a staff with holes place around each end and one in the middle the hot rubber gets poured down into the bamboo and the the stone are place filling the holes before it cools and one capping the ends and then one being in the center for the control of the stones and what would be pretty cool is if he starts swinging hard enough the stones would pull out of the holes and act like a short range whip to act like a staff flail
may I introduce you to the ballester or stone bow? this lovely device looks and functions as a crossbow but has 2 strings and a cup where stones or metal bearings can be placed as ammunition. has the same launch force as a standard crossbow but uses ammunition pellets about 1 inch in diameter.. much better for force and accuracy then a slingshot. after that id just make a holy type wooden cane for close up melee
Who ya gunna call? who YA GUNNA CALL !!! GHost busters!!! perhaps the shot could provide you with a few particle accelerator packs and some trapping moduals. we also havd a special lightining arrays what can purify ghosts! the cost for the packs are only 10k DP and the cost of the array is well lets say you wouldnt get any DP from the SPD