Given my crew are all lvl 125, I don't see a single red con.
Named mobs that drop the requisite items:
Shambling Archer drops Hilus's Jounal - Located near entrance.
Blighted Spiritualist drops Ailil's Phial - located in the northern most central room.
Scion of Blood drops Bartik's Heart - located in West most room near end of zone.
Scion of Darkness drops Keelia's Heart - located in West most room near end of zone.
Forceful Presence drops Sila's Medallion - located in the NW most room