The flumph was a curious and benevolent creature that drifted through the dark caverns of the Deepways. Small, saucer-shaped creatures, their soft bodies adorned with gentle, glowing patterns. They had numerous tendrils dangling from their undersides, which they used for both locomotion and sensing their environment. Typical flumphs were white, while monastic flumphs were pale yellow or green, with tentacles ending in darker shades. Flumphs also glowed faintly in different colors depending on their mood: generally, pink represented amusement, green represented curiosity, blue represented sadness, and red represented anger.
Despite their alien appearance, flumphs were highly intelligent and empathetic beings, communicating through an emotional Telepathy. They thrived in areas where they could access the thoughts of other creatures, using their telepathic abilities to glean information and share knowledge. They fed off the mental energy of other creatures, particularly psionic beings, but most creatures did not experience any pain or loss when flumphs fed. Unlike many denizens of the Underdark, they were inherently good-natured, seeking to aid those in need and oppose the forces of evil.
Flumphs were wise and possessed advanced knowledge of philosophy and other subjects. However, due to their strong telepathic nature, they were very sensitive to evil thoughts and felt the need to share them as quickly as possible with any good-aligned creatures they found, in order to wash these thoughts away.