For a century, Xandara was a master surveyor for the Understone clan, mapping the 'chaos' of the Underdark with a quiet, growing resentment. That resentment turned into religious ecstasy during the Great Subsidence of the Deep Reach. As millions of tons of granite groaned and collapsed, her entire lineage was pulverized into gray silt. Xandara alone remained untouched. She was pinned within a pocket of air precisely three feet wide, formed by three jagged slabs of obsidian leaning against each other at perfect 60-degree angles. In the three days of absolute silence that followed, she didn't pray to the gods of the gnomes; she listened to the heartbeat of the stones. She realized her life was not saved by luck, but by the undeniable, cold perfection of geometry.
When she finally dug herself out, Xandara was no longer a creature of flesh and whimsy. She had touched the cogs of Mechanus in the dark. She began to see the world as a sprawling, poorly maintained machine where every erratic heartbeat was a rhythmic error and every scream of pain was merely a squeaky hinge requiring oil—or removal. She started with her own body, replacing her 'irregular' left arm with a housing for the Gear of Finality, a relic she spent decades forging from the metal of the very collapse that claimed her kin. She now wanders the deep tunnels, seeking to 're-index' the world, one messy variable at a time.