Promhull

History & Description
Promhull is a sacred or holy site, due to what happened there. It used to be an ice palace that held 115 Hearts of the Sea. It represented a primordial elemental that was killed or trapped there.

The gems are held in the Chandelier of Life, which either held the deity or its essence.

It’s not on Gristol, but much further south, on an island in the Frozen Sea. The palace itself is made of jagged pieces of crystal or ice, criss-crossing each other in a way that vaguely forms a structure. It sits in an ice field, curling with wisps of snow. Within is an altar, with the Chandelier overhead. The Hexblade's weapon is meant to be laid on the altar.

The Frozen Sea
It’s south of the Asurion region. Two months travel by boat will get you to the beginnings of iceburgs. You’ll need an ice breaker ship. And dress for the occasion. There are at least two sea serpents. There’s a large island down there. You have to walk across ice fields to get to it. Most animals are cold hardy. Don’t camp in the open at night. It gets very cold and you will freeze. There are glacial elementals.