a quick look on guru revealed that you can buy 1 for 35k-42kDrago's Flatbow
he's one of those bosses in Sorrow's Furnace, i tried soloing him after i killed the mobs around him but couldnt, i need a different build i guess. He causes bleeding and uses Troll Unguent like crazy, i tried a 105 monk with:
Shield of Absord
And i could cause enough damage cuz i was trying to counter the degen from bleeding too much. I think hexes might be better using Emapthy or Spiteful Spirit[e]. But if you had 2 people to kill him it would be much easier. A ranger to interupt his Troll and cause dmg and a tank to cause additional dmg and maybe even drain his energy. He is a pain though, lol.