A Xeroglyph egg switches and changes the glyphs displayed on its face every 10 seconds. Each time, the configuration of glyphs is completely unique. It never repeats. Thus, it is thought Xeroglyphs possess a connection to deep and ancient knowledge of the Old Age.
The Science and Research Center in Ark City is still trying to understand how these glyphs are stored in the memory of this species. Is it found in a Xeroglyph's genetic code?
After hatching, Xeroglyphs stop changing their pictograms every 10 seconds. Instead, Xeroglyphs begin using their lower face to express their emotions and how they feel. When Xeroglyphs do begin changing their lower face in rapid succession (like every 30 seconds) it means that they are trying to tell you a story based on the ancient hieroglyphs of the Old Age.
Xeroglyphs have been well studied by the Science and Research Center in Ark City. Most of the information that Xeroglyphs have provided to researchers hasn't been that useful. However, there was an instance a short time ago where a Xeroglyph (simply named "X") told researchers the exact location of a tomb inside of the buried pyramids of the Northern Plains. When researchers reached and excavated the area, they found exactly what the Xeroglyph had told them—a tomb filled with treasure. How the Xeroglyph itself knew the exact location remains a mystery, but suggests a unique relationship to time and memory.