
Owen Black offers amnesty for the third key because he needs the Ash Vault to stay closed until Mara's file is ash-tagged.
Owen would rather forgive the key than let Mara use it, which is the clearest sign the vault contains something worse than contraband.
Source stage
More discoveries

Adelaide Frost wants Elias to sing the burned bondsong because one missing consent line lets her seize the dragon.

Adelaide Frost treats the quiet badge as a medical risk, though her separation order was drafted before it went silent.

Adelaide Frost wants Elias to accept the glass receipt before he learns which house bought his freedom.

Adelaide Frost calls Elias's vanished seat a clerical revision while steering his dragon toward a politically safer cadet.