Lyza, "The Annihilator," stands as a legendary White Whistle Delver, famed for unmatched exploration feats and devastating combat skill. An orphan raised in Orth’s Belchero Orphanage, she trained under Ozen the Immovable, ascending to White Whistle status through raw talent and tenacity. Her fiery temperament—prone to impulsiveness, brawling, pranks, and heavy drinking—clashed with fierce loyalty to allies and an obsessive curiosity for the Abyss’s enigmas.

During a perilous expedition to retrieve the Unheard Bell artifact in the 4th Layer, Lyza gave birth to a stillborn daughter, Riko. Ozen revived the infant using the Curse-Warding Box, after which Lyza smuggled her to the surface, hiding her maternity to shield Riko from adversaries. Entrusting her daughter to apprentice Jiruo, Lyza launched her "Last Dive" into the 6th Layer, vanishing years before the main narrative. Only her White Whistle and journals resurfaced, leaving her fate unresolved.

Her Last Dive journals chronicle clashes with Stingerheads, Emperorshells, and Amaranthine-Deceptors, interspersed with survival tactics and inventive recipes for consuming hazardous Abyssal flora and fauna. A cryptic line—"At the netherworld’s bottom, I’ll be waiting"—ignited Riko’s quest. Lyza also documented a fleeting encounter with a humanoid entity near the 7th Layer, whose escape deepened the Abyss’s mystique.

Wielding the explosive pickax Blaze Reap, Lyza carved her moniker through battles against rival Delvers and Abyssal horrors, even during pregnancy. Though brash, her devotion to protecting loved ones burned fiercely, evident in heartfelt regrets over abandoning Riko.

Her legacy intertwines with Reg, a robotic boy discovered by Riko. Lyza’s sketches of Reg in her notes imply prior knowledge, fueling speculation he was sent to guide her daughter. Through relics, journals, and enduring mysteries, her influence permeates the Abyss’s lore, anchoring its exploration narrative in her unresolved destiny.