The Heat Shrine

A cracked basalt slab above the fumarole fields, cup-marks and ash-channels carved into it by some old community as an offering place to the mountain — Threnn tends a fire here now that he cannot explain.

The cup-marks are spaced in the same intervals as the Cindervault's working-plan. Someone designed both, or both are the mountain's design. Threnn arrived as an Ashen Temple missionary and stayed as something he has no name for, feeding the offering-fire ash and quiet.