Grindelwald finds out that Credence is the obscurial a different way. Grindelwald's prisoner, the real Percival Graves isn't cooperating very well, so Grindelwald decides to bring in Credence and torture him in front of Graves. He figures that he can always obliviate Credence afterwards to maintain their rapport. However, Credence, on seeing his mentor being held prisoner, loses control of the obscurus and ends up saving Graves (and keeping himself alive).

Note: If any potential filler wants to pair Credence with Graves or Grindelwald, that's fine as long as Credence is 18 or older in the fic. Please no adult/child pairing.