Once you reached
level 68, this quest might be a shock to you. The starting NPC (non-playable character) to talked with is
Xian at
Rahkon Dungeon Level 2 (R2) hallway. Once you completed
110 Vileplant kills you will need to deliver it to NPC
Kuro...
About Kuro, where is he by the way?
I just downloaded the map and placed information about it. I hope it can help much. I also placed comments in some areas to help you for monster kills. Be careful though.
Anyways, you will do Deadly Vileplant kills and so on...
Starting from R2 Hallway, monster levels ranged from level 62 - 70s once you got deeper at the dungeon.
Good luck!
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picture taken from photobucket - chimen87>