The Sphinx Landmark was formed from a large deposit of matter from the fallen star Ethian that had landed within the Mhojave Desert. Taking the shape of a crystalline megalith with the body of a lion and the head of a human, the Sphinx was unique even among the enigmatic landmarks. The Sphinx was sentient and remained aloof throughout most of the year, but became interested in small slips of paper bearing riddles during the time of Ethian's Crossing. Adventures found they could influence the beast's alignment when it deigned to pay attention to them because of the notes. The tinge the beast's crystal body took determined it's attunement; when it was red, it was known as the Ruby Sphinx and generated Essence for Necromancy, when it was blue, the Sapphire Sphinx would generate Devotion for Spirituality. Another odd note about the Sphinx, it's behavior suggested it disliked the conversion required to change aspects, lashing out at those who would say Ruby to it while it was in the Sapphire aspect and those who would say Sphinx in its Ruby aspect.
The corruption of energy caused by the failed experiment conducted by the Conclave revealed another difference between it and the other landmarks, the Sphinx was mobile. Rampaging across the desert during the Reflection Incident, the beast was finally put down and reduced to the rubble by Blaise and Proficy. Years later the pile of shattered crystal would be consumed by the birth of Lady Makali.