Swapped to a Prisoner, Married to Hades

Moira is a noblewoman whose husband and father sacrificed her at her own wedding. She wakes seven days before that wedding with the memory intact. She lets her stepsister Lyra have Arian, the war hero she married the first time, and instead takes as husband a blind prisoner named Darian, chained beneath the temple. Darian is Hades, betrayed and bound, his heart split into three Underworld Keys. The marriage binds her life to his. She can hear the last words of the dead and open the gates of the underworld, and every use of that power takes years off her own life. Arian turns out to be Ares. Her father and Zeus are the ones running the arrangement that puts brides on the altar. Moira refuses to be one of them again and moves against Olympus.