21.0 Patch Notes – United in Stormwind Pre-load, New Battlegrounds Hero, Big Duels Update, Book of Heroes: Illidan, Arena Rotation, Bug Fixes

Patch 21.0 has just launched on PC (mobile release might take a bit longer, like always). Here’s a quick summary of what you can expect from it:

  • United in Stormwind pre-load – All of the new cards etc. are added to the game, which means that you won’t have to download anything when expansion launches.
  • New Battlegrounds Hero – Galewing. Choose a flight path for free as a Hero Power, then get a reward after 1/3/5 turns.
  • Big Duels Update – New passives, buckets, banned cards, new sets added to rotation (Kobolds & Catacombs + United in Stormwind).
  • New Arena Rotation – United in Stormwind, Forged in the Barrens (+Wailing Caverns), Madness at the Darkmoon Faire (+Darkmoon Races), The Witchwood, Saviors of Uldum, Rastakhan’s Rumble, Core Set.
  • Book of Heroes: Illidan – New chapter of Book of Heroes is dropping on August 10, a week after expansion’s launch.
  • Bug Fixes – Patch includes A LOT of bug fixes and/or QoL changes.

Check out full patch notes below:

The 21.0 patch prepares the Tavern for United in Stormwind, launching August 3. It also brings a new Hero and cosmetics for Battlegrounds, a major update for Duels, an Arena rotation, and more.

You can check out all 135 new cards included in United in Stormwind on the card library here.

Battlegrounds Updates



  • Dungar’s Gryphon
    • Choose a flightpath. Complete it to get a bonus!


Players with Battlegrounds Perks will have early access to Galewing before it’s formally released on August 10.

Duels Updates

When the 21.0 patch goes live on July 27, all players’ Duels ratings will be reset and the pool of eligible cards you can use to build your 15-card start deck will be updated as follows:


Party Replacement

  • At the start of your turn, summon a 2/2 Adventurer with a random bonus effect.


Inspiring Presence

  • After you play a Legendary minion, reduce the cost of a random minion in your hand by (1).


Greedy Gains

  • Your minions have +2/+2 but cost (2) more (up to 10).


Meek Mastery

  • Your Neutral minions cost (1) less and have +1/+1.


Legendary Loot

  • At the start of the game, equip a random Legendary weapon.


Deathly Death!

  • After a friendly Deathrattle minion dies, destroy the minion with the lowest Health.


Ooops, All Spells!

  • At the start of the game, destroy all minions in your deck. Your spells cost (1) less and gain +2 Spell Damage.



The following cards have been banned from between-game card buckets and will not be Discoverable:

  • Final Showdown
  • Lost in the Park
  • Defend the Dwarven District
  • Sorcerer’s Gambit
  • Rise to the Occasion
  • Seek Guidance
  • Find the Imposter
  • Command the Elements
  • The Demon Seed
  • Raid the Docks

Other Banned cards:

  • Unstable Evolution is banned from card buckets but will still be Discoverable.
  • Maestra of the Masquerade is banned from deckbuilding, card buckets, and will not be Discoverable.

Seven new designer card buckets have been added as well:

  • Furious Fel (Demon Hunter)
  • AHHHH RATS!!!! (Hunter)
  • Fire!!! (Mage)
  • SI:7 (Rogue)
  • ARRRRRRG! (Warrior)
  • Auction House (Neutral)
  • Live to Win (Neutral)

Smart buckets have also been updated to include the two new card sets, and two previously missed card sets: Legacy (Classic/Basic) and Demon Hunter Initiate. Lastly, you’ll be able to find United in Stormwind cards in Duels card buckets after the patch goes live and before the expansion launches.

Arena Rotation


When United in Stormwind launches on August 3, the Arena will include cards from the following sets:

Book of Heroes Illidan – Coming August 10


After regaining his freedom, Illidan was eager to prove himself once and for all. But even as he journeyed far from his homeland and joined forces with new allies, the thirst for power never left him. It was only a matter of time before it interfered with his judgment, resulting in more dire consequences than ever before…Defeating all 8 bosses in this linear adventure will reward 1 Demon Hunter pack, containing only Demon Hunter cards from Standard.

United in Stormwind Rewards Track & Tavern Pass

When the Rewards Track refreshes when United in Stormwind launches, all players will automatically be granted any unclaimed rewards on both the free track and the Tavern Pass track (if purchased), and a completely new Rewards Track of unlockable loot will take its place.


Please note that incomplete Forged in the Barrens Gameplay achievements will no longer grant Reward Track XP once United in Stormwind releases on August 3, at which point the United in Stormwind Gameplay achievements will take over, so don’t forget to finish and claim those before you’ve left the Barrens.


The Forged in the Barrens Tavern Pass will expire with the launch of United in Stormwind and a new Tavern Pass will be made available for purchase—offering a host of brand-new cosmetic rewards and XP boosts.


Learn more about the United in Stormwind Rewards Track and Tavern Pass here.

As a reminder, Battlegrounds Perks are now available as a standalone purchase, separate from the Tavern Pass.

New Cosmetic Coins

Two new Cosmetic Coins are being added with United in Stormwind, the Stormwind coin and the Lordaeron coin. The Stormwind coin is obtainable by completing the first 90 levels of the Rewards Track with the Tavern Pass. The Lordaeron coin is obtainable by collecting 135 unique United in Stormwind cards.


Keep in mind that United in Stormwind will have a 35-card Mini-Set that will make it easier to reach both the 25 total United in Stormwind Legendary cards for the Archbishop Benedictus Diamond card reward and the 135 total United in Stormwind cards for the Lordaeron Cosmetic Coin. We’ll have more information to share about the United in Stormwind Mini-Set in the coming months.

Bug Fixes & Game Improvements

  • Fixed a bug where Shenanigans would not transform Soul Fragments into Bananas.
  • Fixed a bug where Wicked Stab could be upgraded by cards that temporarily increase mana.
  • Fixed a bug where Shan’do Wildclaw would not lay flat on the board.
  • Fixed a bug where Defender would not play its VO when summoned by Noble Sacrifice.
  • Fixed a bug where golden Soul of the Forest would not summon golden Treants.
  • Fixed a bug where golden Ancestral Spirit would not summon a golden minion.
  • Fixed a bug where golden Grave Rune would not summon golden minions.
  • Fixed a bug where golden Primal Talisman would not summon golden minions.
  • Fixed a Battlegrounds bug where Y’shaarj’s Battlegrounds Hero Power would not take its newly summoned minion into account when deciding which warband attacked first.
  • Fixed a Battlegrounds bug where Baron Rivendare was causing visual issues when in a warband with golden Kaboom Bot.
  • Fixed a Battlegrounds bug where Galakrond’s Greed was missing a tooltip for Discover.
  • Fixed a Battlegrounds bug where Come One, Come All! Was missing a tooltip for Discover.
  • Fixed a Battlegrounds bug where Avatar of N’Zoth was missing a tooltip for Deathrattle.
  • Fixed a Battlegrounds bug where Sprout It Out! Was missing a tooltip for Taunt.
  • Fixed a Battlegrounds bug where Hero Powers for Aranna Starseeker, Infinite Toki, Millhouse Manastorm, Nozdormu, and Tess Greymane were missing a tooltip for Refresh.
  • Fixed a Duels bug where Diamond cards would only be Diamond in appearance for the first game of a run.
  • Fixed a Duels bug where Lone Champion and minions summoned by Gift of Luminance were not buffed by Hold the Line.
  • Updated the description of the Roguish Maneuvers Hero Power in Duels to be more accurate.
  • Fixed a bug with Book of Mercenaries Guff where A Party of Adventurers will cast Against All Odds, even if they have board control.
  • Fixed a bug where one of Lady Katrana Prestor’s emotes was showing incorrect text.
  • Searching “Refund” in the Collection will now populate with cards eligible for a dust refund.
  • Pressing and holding on the Rewards Track page arrows will now flip through the pages quickly.
  • Fixed a bug where if a player disconnected from a ranked match, they’d get a message stating they won their last ranked game upon relogging.


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A Hearthstone player and writer from Poland, Stonekeep has been in a love-hate relationship with Hearthstone since Closed Beta. Over that time, he has achieved many high Legend climbs and infinite Arena runs. He's the current admin of Hearthstone Top Decks.

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Leave a Reply


  1. Pandamonium
    July 29, 2021 at 6:13 pm

    Also with the rotation of duels, it was supposed to be something other than “wizard duels” with different cover art and possibly sets rotated out. Didn’t take long to bail on that premise before it started. Why so hard to figure out that it should simply have mouseover for what sets are active and keep up on the things they implemented in the game? Just never planning on removing the beta tags from battleground and duels is a foolish money-grab. Who told these people you can call things beta without ever planning on finishing?

  2. Pandamonium
    July 29, 2021 at 5:51 pm

    Beautiful layout of rewards track items ^ ^

  3. H0lysatan
    July 27, 2021 at 7:19 pm

    A bunch of bugfixes, and they still haven’t fix the Rokara Book of Mercenaries.
    I finished it the day it released, and I still haven’t get the achievement for it. Still showing 8 new chapters in the book.

    Otherwise, good reward track as usual, compared to the previous free Epic cards (Primordial), this time, we got a free meme Epic cards (Elwynn Boar). I just hope I don’t open this card from packs. (useless 100 dust).

    Getting Standard pack is good improvements too. I’ve been missing cards from Barrens, and I don’t wanna buy barrens pack anymore. Maybe if they change Tavern Brawl reward into Standard pack, that would be awesome.

    But seeing the latest Achievement from Stormwind gonna make me puke. Grinding takes longer and harder. One example is Warlock, redirect 666 damage using Questline Tamsin. That’s hell

    • Generalflagada
      July 27, 2021 at 11:48 pm

      I had the rokara bug,
      Just did the adventure again and got the archivement

      • Pandamonium
        July 29, 2021 at 5:44 pm

        Screw that. You didn’t get another pack did you? I’ll wait since they fixed the 2 achievements before that they forgot to put in the game prior to the book releasing, but you’d think that even if they did forget to put the achievements in first that it could still read that it’s been done. Actually the odd thing is that on the adventure screen itself it shows 8 unfinished so it’s more than just the achievement erring.

        • Generalflagada
          July 30, 2021 at 11:51 pm

          No new pack, just the 1 only
          The rokara story is easy enough to do while I took a dump
          I did it because it was bothering me that I had the 8 unfinished thing like you