Drakuru wants you to bring the Heart of the Ancients to him at Drak'atal Passage.
You will need to collect 5 Desperate Mojo to use the elixir there.
<Drakuru's voice fills your mind.>
Hey, mon! Dis eye of da prophets be great! I been usin' it to watch ya and I see ya got da heart now! Not bad....
Now ya just gotta bring it to my brazier at Drak'atal Passage, a short walk east of ya.
Ya must drink my elixir at da pedestal to summon me there. This time, ya need ta mix in some desperate mojo from the defenders there for it ta be workin'.