What's that one story...
with the magic crystal made of souls
that’s protected by the kings of the past
and it helped its society develop rapidly
and that if the people are in danger,
the crystal will choose a royal champion as a vessel to protect them
(and has a tendency to absorb said royal)
and the crystal had to be hidden away to keep it and everyone safe
but some baddies show up to steal the crystal
and the crystal is totally the Heart of the World
AND THEREFORE SHOULD BE IN KINGDOM HEARTS!
(x)