The Spirit of Rhunok has asked you to use the Tormentor's Incense to awaken his body. You are then to slay Rhunok using the power that his spirit has imbued you with. If for some reason you lose the Mojo of Rhunok aura, you can return to the Spirit of Rhunok to have it reapplied.
My body is too far gone now, [player]. It is only a matter of time before a new prophet is elevated and finishes what the other began.
I am going to imbue you with the last of my power. The tormentor inside the altar building carries incense, which will awaken my body and make it vulnerable.
Use the incense and do me the kindness of putting an end to my suffering.
I apologize if I fight back. Even for me, the will to survive is strong.