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A soul bomb is a powerful and destructive weapon devised by the [[witch]] [[Rowena]]with the power of the ''[[Book of the Damned]]''. It uses the light and power of hundreds or of thousands of human [[souls]], and was is believed to be the only thing capable of killing [[Amara]], in hopes that destroying [[the Darkness]] would balance out the [[The Cosmic Balance|Cosmic scales]] after [[God]] was mortally wounded. However, the theory is never proven since the bomb was removed by God after reconciling with Amara.

It is revealed that with [[God]] dying, the scales of [[the Cosmic Balance]] are tipping and soon all life in the universe will die as well. The only way to rebalance the scales would be for [[Amara]] to die as well. [[Chuck]] reveals that [[the Darkness]]' one weakness is light, and they would need "10,000 suns set to supernova" to defeat her. However, with Chuck in his deteriorating state, he is in no position to assist. [[Castiel]] suggests [[soul]]s, as each soul has the power of one hundred suns. Rowena concurs, and tells the group that with enough souls she could create a bomb. As Cas and [[Crowley]] go to [[Heaven]] and [[Hell]] to try and acquire souls, [[Sam]] and [[Dean]] go to Waverly Hills Sanatorium to collect [[ghosts]] for the bomb, since spirits are just souls that have not moved on. Dean uses the "magic word" for the crystal; Haggis, and a dozen or so souls are absorbed into it as soon as it was activated.

After the Winchesters have collected a dozen or so souls for returned from Waverly Hills, Castiel reveals that the angels in Heaven are aware that God is dying and have decided to seal up Heaven and "die with dignity," denying Castiel any souls. Crowley does not fare well either, as he reveals that after Lucifer took over Hell, a bunch of demons raided Crowley's "stash," leaving him with nothing. Realizing they do not have enough, the [[reaper]] [[Billie]] enters the [[Men of Letters Bunker]]. Having noticed Sam and Dean in Waverly Hills, she offers her services by raiding [[the Veil]] of a couple hundred thousand souls. The souls are placed in Rowena's crystal. Since Dean is the only one who could get close enough to Amara, he would have to sacrifice himself as the actual bomb. Rowena performs a ritual that transfers all the souls into Dean, telling him when he gets close to Amara to press his index finger and thumb together, which will activate the bomb.