Summary
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The new Honkai: Star Rail leak reveals a 5-star Mydei character with a unique kit and the potential to outperform top DPS units.
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Mydei is set to debut in Honkai: Star Rail Version 3.1 in late March, which will feature skills that consume HP for massive damage.
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The limited official information about Mydea reveals that she is a powerful warrior on a quest to challenge the gods and reclaim her homeland.
New Honkai: Star Rail the leak has revealed extensive information about a new 5-star Mydei character expected to join the roster soon. Honkai: Star Rail already revealed Mydei's official introduction and splash art, which is HoYoverse's typical method of announcing new additions to the roster.
Mydei isn't the only five-star character announced Honkai: Star Rail 3.1. The games' social media accounts also introduced Tribbie, a mysterious character with many personalities. HoYovere previously confirmed that Mydei will follow the Path of Destruction, a role usually reserved for strong DPS characters with decent survivability.

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Although Honkai: Star Rail 3.0 hasn't arrived yet, a new set of leaks has revealed more information about Mydea, the five-star character confirmed for the 3.1 update. According to the post on Honkai: Star Rail The subreddit leaks, Mydei's Skill causes him to drain his HP and deal imaginary damage to multiple targets that increases by his maximum HP. Mydei's Ultimate also has a similar effect, causing him to restore some of his HP and deal more damage to a group of enemies. Mydei's deck will rely on his Blood for Blood talent to enter the Vendetta state. During this state, Mydei becomes immune to Crowd Control debuffs and greatly increases her Max HP.
Honkai Explained: Star Rail: Mydei Kit
According to previous leaks, Mydei's performance could even surpass Feixiao, which is generally considered to be one of the best DPS units in the game Honkai: Star Rail. The leak also hinted that Mydei will include a transformation mechanic in his kit, which could greatly increase his overall damage potential. While rumors suggested that Mydei's kit would benefit from having more Imaginary characters on the team, the beta data revealed these leaks.
Currently, there is limited official information about Mydea outside of the details in his official Honkai: Star Rail introduction. This announcement revealed that the figure, also known as Mydemius, is the prince of the mist-shrouded city of Kremnos. He is a mighty warrior who must endure countless deaths to challenge the gods, overcome his mortal powers, and reclaim his homeland.
As for the Mydei release date, the timing of its announcement strongly suggests that it will debut in the second phase of the upcoming Honkai: Star Rail Version 3.1. Based on HoYoverse's usual update schedule, the second phase of 3.1 should arrive in late March, assuming the 3.0 banners stick to their typical three-week duration.