Igasho the Elder

Elder Igasho is standing in the area just before Ormorock the Tree-Shaper.
You can run there without agroing any monsters as a lvl 80 on normal difficulty

Solo-able as a 80 DK :D
Quick Tips:
-Make sure you have Unholy Aura for that extra speed.
-Don't overestimate the aggro radius, but don't be too reckless.
-Move with the flow of the pats and hug those edges!
-Oh, and make sure it's set on normal.
-There's a total of five patrols.
-IF (and you will) pick up those annoying, pesky little non-elite plants

What I did:
-Move to Keristrasza's room (center room), watch for lone dragon pat, go right
-As you enter Ormorok the Tree-Shaper's wing hug the left wall, but don't go in until the first pat has moved away from you.
-You'll hit a "corner" pretty quickly. (By corner, I mean the intersection between the wall of the wings and semi-circle that jets out of the same said wall). Stay in the corner until the first pat passes you.
-Go diagonally into another corner (this one an intersection between the tree and wall). You'll notice 3 things: the first pat, the second pat, and a big tree. This is the hardest part, because those three things meet at this particular area. BUT...their aggro radius isn't too large, so with careful maneuvering, you'll pass this area. BUT ALSO...don't go until you see the third pat move away, because the next step is critical! (Like I said, this is the hardest part of the instance :D)
-Now, move and turn right (don't turn right where the second pat's patrol area, rather the second right) and move all the way into the corridor between Ormorok the Tree-Shaper's wing and Anomalus' wing. Wait for the third pat, then move behind them and hug the wall of the wing (i.e. don't hug the semi-circle wall to your left)
-Keep hugging the wall, eventually you'll see a empty space, go into it and wait for the fourth pat to pass by.
-Run into the area before Ormorok encounter. If you see the fifth pat, either run back to the empty space or suicide it and try to get the elder. (The last part didn't happen to me, got lucky with it, but those are my suggestions).
- /dance :D

(Sorry for the length, just being thorough)

Go to Keristraza's room and turn right to avoid the dragonkins... then get ready to practice your pat dodging skills leading up to him.