In Game Description
An iron key with a 'II' etched into it.
It opens the locked cell on the east wing of
the 2nd floor of the Prison of Hope.
3-1 Prison of Hope, 2F E, far cell
3-1 Prison of Hope, 2F E cells
2F W Cell Key required first from 3-2
You must also obtain the Dull Rat's Ring from Rydell and not kill him to access 2F E
Freeing Rydell does not stop him from showing up as a Black Phantom in Pure Black World Tendency