The chamber where the Black Soulstone formed from the essence of Diablo is set to be stored, until Malthael bursts in and steals it.
Diablo 3 Reaper of Souls: Soulstone Chamber
From Orcz
The chamber where the Black Soulstone formed from the essence of Diablo is set to be stored, until Malthael bursts in and steals it.
