there are 3 camps that I can think of in Natimbi
1. Across the river from the Boat ramp
2. Above camp 1 all around the hill and especially on the north side of the hill
3. The North end camp, north of the river, east of the platform where the druid epic is done.
I killed for days at camp 1 and 2 and had no manes drop, alhough they have dropped in the past. The best camp was #3 and they started dropping right away. There's only 4 or 5 Hynids there so its a waiting game if you can kill them right away. As a druid I DC the Cragwalkers and let them kill for me.