A volcanic basin under a smoke-dimmed sky and Earth-like gravity. Sulfur vents and scalding mineral pools dot fields of cooled basalt; the air is thin and acrid, and heat from below — not sunlight — drives much of life here.
Anchors beside the hottest vents, feeding through bacteria housed in its body wall.
You choose the situation, not the result. Selection acts on Vent-Tubeworm; the descendant appears above.
Climate
Resources & space
Predators & life
Habitat & extremes
Mate Vent-Tubeworm with another branch of the same lineage to make a hybrid.