On August 31, Hearthstone's new mode Mercenaries was revealed on the PlayHearthstone Twitch channel stream. Mercenaries is the new game mode where you collect iconic Mercenaries, assembling Parties to take down procedurally-generated Bounties. It is a mode combining RPG and roguelike elements, with characters from Hearthstone. 

The design of Hearthstone Mercenaries is different from the constructed mode. Each player chooses three Mercenaries to play and each Mercenary has it's own ability, speed, and cooldown. You can build a team with any combination of Mercenaries, but neglecting one Role or another might expose your Party’s weaknesses. While on offense, Fighters deal double damage to Casters, Casters deal double damage to Protectors, and Protectors deal double damage to Fighters. You’ll want to keep these weaknesses in mind when building your Party.

When you select a Mercenary in the Tavern, you will notice that each Mercenary has slots for Abilities and Equipment. These are another way to find synergies between your Mercenaries. At level 1, each Mercenary only has one Ability, but you unlock a second at level 5 and a third at level 15.

Once Mercenaries launches on October 12 eight Mercenaries will be available for free. Details of the eight Mercenaries are pictured below.

Also, the Mercenaries does not limit to the characters of Warcraft. Diablo will be coming to Mercenaries with the launch. The Diablo Mercenaries Pre-Purchase Bundle includes a Diamond Legendary Diablo Mercenary Card and 50 Mercenaries Packs.

Hearthstone Mercenaries will be launching on October 12. Until the release, three different Mercaneries pre-orders will be available. The Diablo Mercenaries Pre-Purchase Bundle includes a Diamond Legendary Diablo Mercenary Card and 50 Mercenaries Packs; the Lich King Mercenaries Pre-Purchase Bundle includes a Diamond Legendary Lich King Mercenary Card and 50 Mercenaries Packs; and the Sylvanas Mercenaries Bundle includes a Golden Legendary Sylvanas Mercenary Card and 30 Mercenaries Packs.

For more details, check out Hearthstone's official post.