I could handle that!
OK, So remember how in last weeks episode Sam was saying to take down the Leviations they would need the Bone of a "Righteous Man" & the blood of the "3 Fallen?" Well I found this GIF that explains who the 3 fallen are!
"A fallen Angel, the ruler of fallen humanity and a father of fallen beasts.” Anyone wanna take guesses on who these people are? Castiel is the fallen angel obviously.