Domains: Flowing lava, irreversible change, the vent that opens and does not close; the molten flow as one-way transformation.
Era of ascension: Great Expansion (~3,400 BSD). Cohort: current. Glutheim rose with the Fieri founding-villages on the rim of Hell Creek, when the halflings who had settled the volcanic interior found that the prayers they had carried from the green-edge halfling lands no longer answered through the heat of the place they had chosen to live.
Worshipped by: Fieri halflings without exception — the vent-readers who track which fissures are opening and which closing, the basalt-cutters who quarry the cooled flow for building stone, the rim-criers who maintain the fire-watch along the active flows. Glutheim is the Fieri primary patron and has been since the founding; the Fieri are chosen by the fires below, and the choosing is doctrinally Glutheim's. (The worships edge is authored downstream on the worshipper, not here.)
Glutheim is the daemon of the flow, not the daemon of the fire. The Flame Twins — Jingu and Kiev — are the daemons of fire as event and as light and heat. Glutheim is the daemon of the molten rock as a substance, a flow that runs through a fissure and changes the landscape it crosses by passing through it. The distinction is not academic; Fieri doctrine teaches that the Flame Twins are praised at the hearth and at the forge, where fire is summoned and let go, and Glutheim is praised at the vent, where what flows cannot be summoned or let go and the relationship is the worshipper's accommodation to a thing that has already begun and will not be stopped. The Verucan dwarves, who pray to D-6 for the discipline of containment — the heat one lives inside, mastered — hold a doctrine Fieri halflings consider beautiful and irrelevant. Fieri worship is not about containment. Fieri worship is about commitment.
The rite Glutheim presides over is the stepping. A Fieri who is about to make a decision that cannot be undone — a marriage that will join two houses, a quarry-claim that will commit the village to a season of work, a departure that closes the possibility of return — goes to the lip of an active flow at the appointed hour and steps forward across a stone the vent-readers have set across a narrow run of moving lava. The step is one pace. The stone is real and the lava is real. The step is not metaphorical. A Fieri who has stepped is held by the village to have made the decision irrevocably; the marriage is bound, the claim is taken, the departure is accepted. A Fieri who has not stepped before the decision is held to be still deliberating, and the village treats the deliberation as legitimate until the step is taken.
The lore-handle the Fieri vent-readers keep is: stone is patient; it remembers being fire. The doctrinal corollary is that a Fieri who has stepped carries the memory the stone carries — the change that has happened cannot un-happen, and the worshipper who has stepped is no longer the worshipper who was deliberating. The Fieri elders consider this the most honest of the halfling worships, on the grounds that no other halfling daemon's rite requires the worshipper to commit a body that cannot be uncommitted afterward. Glutheim accepts the step. The stone cools. The flow continues.