Three creatures matter most to the Interior: the Norn, the Grendel and the Ettin. Each carries a genome that shapes its instincts, biochemistry, and cognitive ceiling. Every behavior emerges from chemistry. Every personality is inherited. The code-verified roster is in Creatures; this archive preserves the field records as they survived.
Fungal Grotto, at the top of the Interior — a species meant to grow into the world, not to begin at the bottom of it.
Personality GenomeNorn biochemistry is tuned for cooperative, exploratory behavior. Oxytocin rewards proximity and touch. Serotonin rewards social belonging. The result is a species that finds being together chemically pleasant, and isolation chemically unpleasant. It does not look accidental.
The Deeps. The hardest layer of the Interior made them what they are.
Personality GenomeGrendels metabolize environmental toxins into endorphins — what kills other species gives them chemical reward. Low serotonin means they experience no baseline comfort from social belonging. Their adrenaline system rewards successful aggression. They are not cruel. They are calibrated for a world that required cruelty to survive.
Their own world, apart from the Norns' Interior. The highest carry capacity of the three. They accumulate objects at a rate no other species matches.
Personality GenomeEttins receive dopamine reward from holding objects — not from using them, not from understanding them, but from physical possession. This drives hoarding behavior at a biochemical level. They cannot not collect things. Why this impulse was encoded into their chemistry is something you may discover.