Monster, the Term

The Oath-Bound cosmological framework adds a useful distinction that the PHB’s alignment-based creature categories do not provide. Creatures encountered in play are either oikic — native to the prime material, participants in the natural order of the world — or xenos, cosmological outsiders whose presence in the world is inherently anomalous regardless of their disposition. A dangerous animal is oikic. A demon is xenos. So is a Ki-rin.

This distinction matters practically because it affects how divine actors respond to creatures and what tools are relevant to a given encounter. It is not a moral category. A xenos creature is not evil by definition; it is simply not of this world. The appropriate response to its presence is a different question from whether it is currently causing harm.

The Monster Manual remains the primary creature reference for Oath-Bound, with the caveat that alignment-defined creature characteristics — inherent Good or Evil, Law or Chaos — do not translate directly. A creature’s disposition toward the characters is a function of its nature, its circumstances, and the encounter context, not its alignment entry.