Murder at Castle Nathria is Hearthstone's 21st expansion, featuring new 135 collectible cards released on August 2, 2022. The expansion depicts a dinner party in Castle Nathria hosted by Sire Denathrius, where he unexpectedly meets his end. Detective Murloc Holmes has been called to solve the case and determine which of the ten suspects committed the crime. Murder at Castle Nathria features a new keyword - Infuse - which allows cards to get more powerful as friendly minions die. The expansion also introduces a brand new card type - Location. Locations are played onto the battlefield for an initial cost, and then have an ability that can be activated for free on your turns, each time for a powerful effect.