Heath Lott is a young knight of the Neo-Britannian Empire's Einberg Order, bearing the title "Weiss Knight" or "White Knight." Ambitious yet inexperienced compared to his peers, he strives to prove his worth and gain recognition, especially in his rivalry with fellow knight Arnold Renck, the "Black Knight." Despite his youth, the Einberg leadership entrusts him with significant responsibilities.

Heath pilots the specialized Knightmare Frame Fleipnir, derived from the same base model as Arnold Renck's Valpnir. Configured for long-range combat, the Fleipnir wields dual rifles, reflecting Heath's preference for engaging enemies at a distance.

During a military operation targeting resistance forces, specifically the Seven Shining Stars, Heath leads Einberg members Narah Vaughn and Christoph Scissorman. However, the resistance, aided by mercenary Rozé's strategy, evades him. Heath falls into Rozé's trap, leading his squad into a warehouse rigged with explosives. This results in significant troop casualties, though Heath escapes physically unharmed.

Reporting the failure to Einberg leadership, Heath attempts to justify the loss by blaming enemy "dirty tricks." His excuses are dismissed, and leader Norland von Lunebelg publicly rejects and dismisses him. Overwhelmed by shame, humiliation, and perceived hopelessness within Neo-Britannia's rigid hierarchy, Heath retreats to his private quarters. There, he succumbs to despair and fear, taking his own life with a firearm. His death illustrates the intense pressure and severe consequences of failure within the Empire's knightly order.