Lilith is a significant entity in the Neon Genesis Evangelion series. She is one of the Seed of Life sent by the First Ancestral Race to Earth, intended to initiate the process of evolution. Lilith is the source of the Second Impact and is pivotal in the Human Instrumentality Project, which seeks to merge all human souls into one. Her enigmatic presence and mysterious origins make her a crucial element in the series' exploration of existential and philosophical themes.