|“||What was done to the Darkness can be done to God, if he's as weak as you say. And I know how. That's the spell.||”|
The Primordial Entity Trapping Spell is a powerful spell that can be used to trap a Primodial Entity.
In 2019, after God begins trying to bring about the end of their world, the Winchesters and Castiel seek a way to trap God as he cannot be killed without ending everything due to God's mandatory existence. After learning that God has a secret fear that he only shared with his favorite, the Winchesters seek out the help of the archangel Michael who they believe to be God's favorite. After being convinced of God's betrayals and the threat his father poses, Michael provides Dean and Castiel with the spell, believing that with God weakened by the Equalizer, it will work. However, Michael warns that they will need a Leviathan Blossom which only grows in Purgatory as one of the ingredients. As such, Michael opens a twelve-hour rift to Purgatory for Dean and Castiel, but refuses to aid them any further.
After returning from Purgatory with the Leviathan Blossom, Dean and Castiel prepare the spell which requires someone to take on a Mark to contain God. Castiel intends to take on the Mark, but Sam refuses to complete the spell after God shows him an alternate timeline where they succeeded and the consequences of it. After finally being able to heal his wound, God is able to harmlessly destroy the spell.
In an alternate timeline God shows Sam, the Winchesters and Castiel are successfully able to perform the spell. However, the Mark drives Castiel crazy and he has to be locked in a Ma'lak Box. Monsters begin running rampant across the world, which God reveals is a consequence of using the spell to lock him away: without God there to maintain the balance between light and dark, darkness prevails.
While most of the procedure is currently unknown, the entity must be in a weakened state for the spell to work and a person must bear the Mark. The spell requires myrrh, cassia, and rock rose, while nectar from a Leviathan Blossom binds everything together. When assembled, the ingredients take the form of a solid sphere that must be used by someone other than the person who will bear the Mark.