Heroes of the Storm - Free Hero Rotation : May 31 - June 6

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• Raynor
• Muradin
• Uther
• Jaina
• Artanis
• Azmodan
• Gazlowe (Slot unlocked at Player Level 5)
• Butcher (Slot unlocked at Player Level 7)
• Lunara (Slot unlocked at Player Level 12)
• Kharazim (Slot unlocked at Player Level 15)

SOURCE