Hearthstone: Murder at Castle Nathria is an adventure addition to the board card game in the fantasy universe of Warcraft. You will find yourself in the castle of Sir Denathrius, where a mysterious murder took place. The famous detective Murlock Holmes and his assistant Dr. Quatson will have to solve the case and identify the criminal. The expansion includes 135 new cards, including 10 legendary minions. According to the plot, each of the minions was in the castle on the night of the murder, and therefore is considered one of the main suspects. You will also find two new mechanics. A new type of "Area" cards allows you to play them for a specified cost, and then activate them on your turn to receive powerful bonuses. And cards with the “Saturation” property become stronger when a certain number of allied creatures die.