What is United Hearthstone questline in Stormwind?

United Hearthstone questline in Stormwind - Blizzard has revealed the second Hearthstone expansion for 2021, United in Stormwind. This will be the second set in the Year of the Griffin, happening Forged in the Wastes.United in Stormwind is bringing two new mechanics to Hearthstone: Tradeable and Questlines. Between the two new keywords, the Questlines are similar to the previous Quests and