Sro-r Need help on getting this quest.

[P0kemonMast]

I already reached 119 and i saw there is this unlimited quest called " Thirst for Blood (Unlimited Repeats)"

I already check the npc in the mirror teleporter that is supposed to have it. It doesnt. Which means I probably gotta finish some other quest first before getting it.

Problem is i checked rev6 for it , and only thing that says in it is that after finishing this quest it unlocks a quest, but it does not say the quest is unlocked by finishing "blah blah blah".

So any one knows how to get this quest?

[MentaL]