Chapter 12 : Cast the Spell

Give the eye in a metal box to One-Eye

If you have both the ring and the carved cross, you'll be given
the choice of selecting a bonus third variation of the ending

If you don't have both of these items, you're not missing much
as the bonus ending is a combination of the other two endings

This is a good place to save as it will let you see each of the
possible endings by choosing different conversation options

Use the spell powder with One-Eye
(must have given the eye in a metal box to One-Eye)

Previous Link to be Added

This free video game walkthrough is for the Nintendo DS
So Blonde : Back to the Island