Hmmm...
The wielded of the Heart needs to be revived? And the that tree, which IIRC is where the “Earl” killed Mana and Neah’s “mother,” shines white?
I wonder, was she actually the wielder of the Heart? Since she and the pre-twins Earl seemed to have been together-together, that would have been one hell of a star-crossed love. Something that suitably dramatic might explain why that Earl disappeared and split into Mana and Neah, perhaps semi-literally torn in half by his conflicting hatred for the Heart and the Innocence and his love for the Heart’s bearer.