The series was closely linked to the seventh season of Buffy . It includes the Slayer 's mystical scythe and her origins . The series was closely linked to the concurrently airing seventh season of Buffy , with coinciding depictions of the Slayer 's mystical scythe and her origins , a major contributor to the expansion of the canonical `` Buffyverse '' in which Buffy the Vampire Slayer and other related stories are set .