 After killing Caleb and returning home, Buffy is struck with an ingenious idea using a powerful scythe that she acquired at the vineyard. Willow will use the scythe to channel it s power into all the Potential Slayer s making every single one around the world into a full-blown slayer. Using this new power, the gang launch an all-out war on The First and the army of Uber-vampires beneath Sunnydale High.