Hearthstone launches Reign of the Black Empire with 135 cards

Blizzard released the Hearthstone expansion Reign of the Black Empire with 135 collectible cards, four neutral Legendary Old Gods — C'Thun, N'Zoth, Yogg-Saron and Y'Shaarj — and the new Assemble keyword. Each Old God has four abilities, two usable per turn, and can attack only after all are spent.

• The expansion adds 135 collectible cards and a story-led Journey in the Hearthstone Journal
• Four Old Gods: C'Thun, N'Zoth, Mastermind Yogg-Saron and Y'Shaarj, one per deck
• Each god has four abilities, two per turn, with attacks unlocked after all are used
• The Assemble keyword swaps part of a summoned minion's text with another from a curated pool