Luthik Uwyr is located near the Jedi Temple Ruins, you can find him among the flora and fauna next to an unusual camp fire.
You say, "Yes I will destroy it."
Luthik Uwyr says, "Though you say that with much vehemence, the results have yet to be seen. Take your hate and your anger and direct it at whatever monstrosity lurks within. If you cannot use your hate as a weapon, then you are not worth our time."
You will get a waypoint that will take you to fight an Ancient Reptilian
Luthik Uwyr says, "You have felt life quenched through the power of your revulsion. The exquisite thrill of giving yourself to the Dark Side will be your gift forever. In the meantime, I shall now attend to the disturbing presence I feel."