The theme explores the possibility of Arthas, the Lich King, successfully defeating all the heroes of Warcraft at Icecrown Citadel and raising them to do his bidding with the malicious powers of Frostmourne.
This brings us to the first new mechanic being introduced in Hearthstone with the upcoming expansion pack. New legendary hero cards will replace the current nine playable heroes with powerful Death Knight versions. These grant new modified abilities and can essentially turn the tide of battle.
The Deathstalker Rexxar legendary hero card, for example, replaces Rexxar by dealing 2 damage to all enemy minions. An accompanying new Zombeast hero power grants the ability to merge two randomly chosen beast cards into an abomination and unleash it on the board.
Each Death Knight was once a mighty hero of Azeroth—but after the Lich King raises a hero from the dead, they gain unimaginable strength from beyond the grave. In Knights of the Frozen Throne, each of Hearthstone’s nine heroes has embraced the Lich King’s dark power to serve him as a Legendary Death Knight Hero card! Despite their transformation, they have not fallen completely under the Lich King’s sway, so it’ll be up to you to decide how to wield the awesome abilities at their command.
Knights of the Frozen Throne is also recognizing Lifesteal as a new keyword for the game. Every class is getting access to minions that can leach health for their hero by doing damage. It would not be surprising if Priests will be able to design entire decks around this new mechanic.
During the announcement, Blizzard hinted the return of Deathrattle minions in a big way. We should be able to learn more when the next round of unveiling takes place for the new expansion pack.
Knights of the Frozen Throne will feature 135 new cards and is scheduled to release in mid-August. The Blizzard Shop has already started taking pre-orders. For $49.99, you will receive 50 card packs of the new expansion. In addition, owners will get access to the “soul-devouring” Frostmourne card back.