So as many of you speculated here, Blood Elves or Lor'themar Theron seeks for Life Blood from the Dark Animus.
When You reach the exalted reputation you get the quest Life Blood that send you to kill Dark Animus, use the crystal to steal his power.
Now we all guess this power comes from Blood of the titan, and Thunder king has ninja the power from Titan also...
So we have Jaina that ask from you to steal the power from lei shen with her staff, and Lor'themar that wants Life blood... They both are worst then Garrosh now (As I see) I do wonder what power is OP here...
Who didn't watch Jaina ask you to steal the power from Thunder King...