Have been able to kill him continuously with a small group. Good group setup is 43+ warden, 50 tank, 50 healer, and a pbae caster. Very weak to heat, big bonus there. Does drop the staffs, but is pretty rare.
We just had a total wipeout to him, 8 lv43s highly tuned. We haven't killed him yet to know level for certain (back-figure from XP) but so far seems pretty certain that his real level is greater than 60.
And it's Goborchen, no Gorbechen or Gorborchend or Goborchend or Gorbachend or Gorbachen or any of the other variations I'm seeing (listed here to help search engines find this page).
Powers that be state he is 60. Goborchend are the others, this one has no D at the end, the rest of them do. I checked into it and this is what I found out.