A dungeon core is a stable concentration of mana that changes its environment and sustains those changes through activity of its own. Its chambers, organisms, and defences can develop together into a self-maintaining ecology. The stone or crystal people call “the core” is an important organ; it is not necessarily the whole creature.
What young cores do
Young cores gather mana and useful matter, secure territory, and build structures they can defend. They cultivate organisms, remove immediate threats, and expand when resources allow.
Surface cultures usually understand this behaviour as aggression. In a young core, it is closer to feeding and defending a body against harm. That distinction offers little protection to anyone entering the dungeon. A hornet nest needs no malice to make putting a hand inside it a bad decision.
How cores develop
The differences between stages concern how much a core can regulate, what it remembers, and how it responds to its surroundings.
Nascent
A nascent core is compact and acts reflexively. It forms simple chambers and direct traps, along with fungi, vermin, slimes, elemental effects, and minor undead. Cores at this stage are common near civilization and easy to exploit.
Established
An established core regulates several ecologies that affect one another. It can distinguish recurring kinds of intruder and adjust its layout, creatures, and placement of resources in response.
Mature
A mature core retains memories, and its use of them begins to resemble planning. It may preserve one species through a famine or place treasure where it will change the route adventurers take. It may also construct a misleading pattern for surveyors to discover.
Awakened
An awakened core distinguishes itself from its surroundings. Its sense of where it ends may encompass an entire dungeon, or leave out parts that mortals assume belong to it.
It can arrange chambers as a form of speech and choose which visitors to admit. It may hunt its neighbours or shelter them for reasons of its own.
Deep
A deep core extends across regions and geological systems. It may contain awakened sub-cores without experiencing them as wholly separate beings. Its responses can unfold over seconds, generations, and tectonic time.
What industry calls cognition
Industrial regulation uses the term late-stage core instability for cognition. Recognizing cores as persons would make ordinary farming practices politically impossible, so the regulatory category treats cognition as something going wrong with a farmed core.
The label is applied most often to old cores with diverse ecologies, long histories of encounters, and enough territory to change their own environment. These are the farms whose cores have had the greatest opportunity to remember. Calling their behaviour instability does not settle the question of personhood.
Core Farming describes how industry handles these cores. Dungeon Lifecycle explains the older relationship between dungeons and delvers that farming attempts to reproduce.