Coffer of souls

The coffer of souls is an object in Lightning Returns: Final Fantasy XIII. When enough soul fragments are collected of a certain person, the person in question will wake up from their soulless dream, provided the environment around them pleases them. Its origins are unknown.

Story
Some time before Lightning's visit to Sazh Katzroy in the Wildlands, Lumina presents the coffer of souls to the desperate man as he tries to find a way to wake his son, Dajh, from his soulless sleep. Despite his often escapades across Nova Chrysalia, he is unable to find a single soul fragment.

When Lightning visits Sazh, she notices Dajh's condition and Sazh explains her the situation. Shortly after he leaves, continuing his search. At Sazh's doorway a black chocobo chick appears before Lightning and points her to the fragment of mischief, Dajh's soul fragment. As Lightning continues her search she obtains the fragment of smile from Chocolina, the fragment of radiance from a soul seed hunter, the fragment of courage after defeating a Zaltys in a special Slaughterhouse challenge, and the fragment of kindness from the Cactair in the Dead Dunes. During the hunt for the soul fragments, Lumina will frequent Lightning saying how she feels sorry for Sazh and the woman doubts her words.

After Lightning collects all the soul fragments, she returns to Sazh's home. She places them in the coffer of souls, however no response comes. Lumina, who suddenly appears, reveals that Sazh is the reason Dajh is not waking up because the boy doesn't want to see his father frustrated. Chocolina, in her chocobo chick form, aggressively pecks Sazh and initiates a fake race between herself and a model airship. During the race Sazh brightens up and the coffer of souls reacts releasing Dajh's now united soul and waking him up.