Darkhollow (Sacred Place) of the Unholy Trio

Steel Realms

Darkhollow (underground) or Darkgrotto (outdoor, but having all light obscured)

Regardless of who the particular place is dedicated to, all unholy places will have all three “broken seals” of the trinity of darkness, inscribed in Blackmark (Markings of Darkhollow). Many a Darkhollow was used as the final resting place for Orrish heroes, typically in a configuration known as “The Black Sleep“. Most Darkhollows have a Shadow Creche.