Hearthstone's next expansion turns heroes into Death Knights

Blizzard has announced the next expansion for card strategy game Hearthstone.

Knights of the Frozen Throne, out in August, adds 135 cards to the game and lets you transform heroes into Death Knights.

Nine of those cards are new legendary Hero Cards that, when played, transform heroes into Death Knights. This gives them frost-rimed armor and modified hero powers. There's a new mechanic, too, called Lifesteal. This heals players for damage dealt.

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