Underground Prisoner -accessible from level 11
This quest can be received from the Necromancer or Koeshu the Occultist .
After killing Fazgrod Resurrected Ghoul  , you can obtain a unique artefact - Deathly Heart and increase your Juggernaut reputation.
If you take the Deathly Heart to Gredeya the Witch or Brugilda the Sorceress, they will exchange it for Quicksilver. The quantity of Quicksilver will directly depend on Juggernaut reputation growth.