When given Eradia, Yggdrasil enables Lightning to extend the lifespan of the world of Nova Chrysalia to the maximum thirteen day limit, and delay the Apocalypse. Each of the Yggdrasil's fruit-like structures represents a day. Despite the limit being thirteen days, Lightning can extend the lifespan of Nova Chrysalia to the fourteenth day, if she manages to give enough Eradia to Yggdrasil to bloom six times which equals to six additional days in order for Lightning to reach Day 13. However, Yggdrasil can bloom seven times, five orbs will bloom on the tree's stem, then the tree's flower blooms partially, and finally the tree's flower blooms completely into an orb.
In-game, this means completing all five Main Quests and forty Side Quests; the Canvas of Prayers' quests do not count toward this, as they do not give any Eradia.
Yggdrasil is an immense tree that is central in Norse cosmology, in connection to which the nine worlds exist.In Norse mythology,
world tree is a motif present in several religions and mythologies, particularly Indo-European religions, Siberian religions, and Native American religions. The world tree is represented as a colossal tree which supports the heavens, thereby connecting the heavens, the terrestrial world, and, through its roots, the underworld. It may also be strongly connected to the motif of the tree of life.The