Hati's spirit is bound to yours forevermore, hunter. But it also now carries a link to the Temple of Storms--as well as Silithus, I fear.
The Thunderspark shares these same bonds. By physically linking it here, you can call upon the different aspects of Hati's spirit and bind them to yourself as well.
Do not worry. Skoll and I will guard the Thunderspark with our very lives! It will be safe.