Han Li vs. Masked Cultivator (Unintentional Absorption)

Not a direct battle. After rescuing the unconscious masked cultivator (Nan Gong Ping), Han Li tried to check her pulse by injecting spiritual power. This triggered her 'Cycle of Reincarnation True Art', which forcibly absorbed Han Li's spiritual power and true essence. Han Li was unable to break free and watched his cultivation plummet from Foundation Establishment mid-stage to Qi Condensation stage 3-4 before passing out.