Details:

Complete 15 Heroes of the Storm matches with a friend while playing as Warcraft Heroes before the event concludes.
Players who select Warcraft Heroes will earn quest credit regardless of which Heroes their friends choose, but remember, credit is only granted to those playing Warcraft Heroes.
Players do not need to complete all 15 matches with the same friend in order to complete the quest.

Rewards：

World of Warcraft: Primal Flamesaber Mount

Heroes of the Storm: 10-day Stimpack

Heroes of the Storm: Flames of Judgement Charger Mount