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Buy Scarlet Void Flyer mount boost — get the incredible and the most prestigious mount, granted for the highest M+ rating, along with The War Within Keystone Hero: Season three feat of Strength achievement. In order to get your Scarlet Void Flyer boosting reward, you shall reach Mythic+ Rating of 3000+ while finishing Mythic +14 dungeons within the time limit, which is hard even with a good team, and almost impossible to do with PUGs.
Keystone Hero is a seasonal achievement and the mount is season-exclusive, meaning that you are only able to receive it during the respective season. When the season ends the achievement is retired and the mount awarded for it becomes exclusive to people, who managed to complete this “feat of strength”.