From Guild Wars Wiki
A Ravenheart Chest will spawn in the Domain of Anguish, nearby, after The Greater Darkness and its group has been defeated. Each player in the party can open the chest once and will receive Torment Gemstones and possibly a Primeval Armor Remnant.
- 1 to 4 Torment Gemstones (depending on how many Lords of Anguish were defeated before The Greater Darkness; twice as many in Hard mode).
- A Spirit of Truth will spawn near the Chest.