This quest is not available in game.
Relwyn Shadestar at the Blackfathom Camp wants 8 Corrupt Brain stems.
Foolish blood elves toil with demonic magic. Have they not witnessed what happened with the naga and with the satyrs of Kalimdor?
I fear that the blood elves will meet a similar deformation. Azeroth cannot afford to give birth to another vile race of monsters.
I wish to study the brain stems of the satyr and naga so that I might deduce what fate the sin'dorei are headed toward. In Blackfathom Deeps, just to the west, you will find both satyr and naga.