Flumph

The mysterious flumphs drift through the Underdark, propelled through the air by the jets whose sound gives them their name. A flumph glows faintly, reflecting its moods in its color. Soft pink means it is amused, deep blue is sadness, green expresses curiosity, and crimson is anger.

Flumphs communicate telepathically. Though they resemble jellyfish, flumphs are sentient beings of great intelligence and wisdom, possessing advanced knowledge of religion, philosophy, mathematics, and countless other subjects. Flumphs are sensitive to the emotional states of nearby creatures. If a creature's thoughts suggest goodness, a flumph seeks that creature out. When facing creatures that exude evil, a flumph flees.