Celestial are a broad classification used by mortal scholars to describe any sentient or non-sentient entity whose origin lies within the realm of a Good Deity. The term refers to a creature's plane of origin, not its appearance, intelligence, personality, or exact role. As a result, celestials are extraordinarily diverse and cannot be identified by a single physical or behavioral trait.
Celestials may appear fully humanoid, partially bestial, draconic, avian, monstrous, or entirely abstract. Some possess recognizable anatomy while others resemble living light, radiant flame, animated constellations, storms, plants, animals, or other supernatural manifestations. Their forms are determined by the nature of the deity and realm from which they originate rather than by any universal celestial body plan.
Intelligence among celestials varies greatly. Some possess brilliant minds, capable of governing divine realms, negotiating with mortals, interpreting divine law, or mastering powerful magic. Others are little more than instinct-driven guardians, messengers, or living manifestations created to perform a specific purpose. Likewise, celestials differ greatly in temperament. Some are compassionate, patient, honorable, curious, or forgiving, while others may be stern, uncompromising, distant, wrathful, or indifferent toward individual mortal concerns.
A celestial's goals are not necessarily identical to those of its creator. Many celestials serve their patron deity with absolute devotion, acting as guardians, priests, emissaries, judges, guides, or warriors. Others pursue their own interpretations of virtue, justice, mercy, duty, or the greater good, occasionally creating disagreements with other servants of the same deity. While they originate from a Good Deity's realm, celestials remain individuals unless explicitly created to function as mindless extensions of divine will.
For scholars and adventurers, the word celestial should therefore be understood as a cosmological classification rather than a description of appearance, morality, or behavior. It identifies where a being comes from, not necessarily how it thinks or acts.