Sphinx of Secrets
Source: Monster Manual (2024) p. 292

Sphinxes of secrets are commonly associated with a site of great magic or learning. These immortal beings often outlive such locations, though, and might protect a site’s ruins as they continue their own studies. Sphinxes of secrets fiercely guard their dwellings and research.
Sphinxes
Collectors and Keepers of Secrets
- Habitat. Desert, Planar (Upper Planes)
- Treasure. Arcana
Sphinxes protect the secrets of the multiverse. Formed from the spirits of sages and explorers, sphinxes know the power of truth and the importance of preserving it. They share their wisdom only with those who prove themselves wise or overcome tests of worthiness, such as riddles or battles with dangerous beasts. Through their existences, sphinxes might change form as they gain more nuanced understanding of cosmic enigmas.
Sphinx Lairs
Sphinxes typically dwell in places that hold great knowledge or prophetic magic.
Quote
Round she is, yet flat as a board
Altar of the Lupine Lords
Jewel on black velvet, pearl in the sea
Unchanged but e’erchanging eternally
Note
Answer to the riddle of White Plume Mountain: The Moon.
