The Azim Steppe

[Daralii]

The House of the Crooked Coin is used by the Dotharl as a place for ritual suicide. According to them if one wanted to return to the Dusk Mother and break the cycle of reincarnation then that is the sacred place to travel to and then throw oneself against the rocks below to die. It features in the side quest, Nhaama's Sweet Embrace.

I'm aware, but that doesn't explain the purple haze or the glowing runes(that look like some of the crystalwork seen in LotA) on the pillars coming out of it. The ritual suicide component is also born from their belief that there's a crystal at the bottom that contains part of Nhaama's essence.