I'm naga-na lie, this wasn't an easy fight! :V

Empress Hashima by MasterGeese: https://boardgamegeek.com/thread/1192545/custom-villain-empress-hashima-borrowed-card-art

thereaver's Sentinels + Cauldron DLC: http://steamcommunity.com/sharedfiles/filedetails/?id=768617500

Adelphophage's Archives: http://steamcommunity.com/sharedfiles/filedetails/?id=1180880406