Opening Purgatory

Opening Purgatory required a complex spell. It allows a caster not only to open purgatory from earth, it also allowed the caster to absorb the souls of Purgatory. Conversely, the spell could also work to reverse its initial effects.

Procedure and Requirements
The spell must be performed during a lunar eclipse. The spell required the blood of a purgatory native in order to work. An intricate sigil is drawn using the blood. The sigil would act as the doorway. Once the sigil is in place, the incantation must then be recited.

The incantation is as follows, "Ianua magna Purgatorii, clausa est ob nos, lumine eius ab oculis nostris retento. 'Sed nunc stamus ad limen huius ianuae magnae et demisse, fideliter, perhonorifice, paramus aperire eam. Creaturae terrificae, 'quarum ungulae et dentes, nunquam tetigerunt carnem humanam. Aperit fauces eius ad mundum nostrum, nunc, ianua magna aperta tandem!"

Usage
This spell was attempted by Crowley and Raphael, although they failed due to them unknowingly using dog blood. The blood they intended to use has been kept by Castiel for himself, as he performed his own attempt. Castiel was successful, and after absorbing all the souls, killed Raphael and declared himself to be the new God.

Appearances

 * Season 6
 * The Man Who Knew Too Much