When you get into a game like Honkai: Star Rail, you get all sorts of wonderful characters that fight with you and travel through a gigantic, action-packed universe. One of them is Mydei, a rough-around-the-edges, no-nonsense fighter introduced to the game through update 3.1, which came out sometime in March 2025. He's unique because he blows his own HP, i.e., he can take a lot of damage, killing monsters left and right, and thus is a risk-reward type of fighter. That's Mydei - how to get him with resources, what he does in battle, and how copies of him (Eidolons) further boost his powers.
If you want to get him leveled up quicker, you might need some Honkai: Star Rail Oneiric Shards, the game's premium currency, that you can get easily from TOPUPlive. Let's get Mydei into his top form!
Who is Mydei?
Mydei is a 5-rank character in Honkai: Star Rail, and he's on the Destruction path, so he's the master of destruction. His Imaginary element is a power that inflicts huge damage on certain enemies. He's from Amphoreus and belongs to a clan called the Chrysos Heirs. Mydei is unique because he hurts himself to injure enemies more. It's like losing a little energy to win big! To play him, you need to know three things: materials to level him, his fighting skills, and how Eidolons level him up.
Materials to Support Mydei
In order to support Mydei, you must acquire materials for two, Ascension and Traces. Ascension is like providing him with strength and height, and Traces enhance his attack and skills. Here is what you must have:
Ascension Materials
They will be asking you to progress even more with Mydei, up to level 80. 15 small Borisin Teeth, 15 medium Borisin Teeth, and 15 large Borisin Teeth, 65 Fear-Stomped Flesh, and 18 Harbinger of Strife will be requested of you. Borisin Teeth are obtained from an area called Calyx (Crimson): Bud of Destruction, where you defeat enemies to obtain them. Fear-Stomped Flesh is obtained from Amphoreus missions, and Harbinger of Strife is obtained from a tough boss battle in Stagnant Shadow: Abyss of Fate. Part credits are also being requested of you - to the tune of 308,000 - to spend to enhance his.
Trace Materials
These increase Mydei's special attacks and tricks by a lot. You will need 15 Borisin Teeth (small), 72 middle, and 139 big ones. You will need 41 Firmament Notes, 56 Celestial Sections, and 58 Divine Choruses - purchase these in Calyx (Golden): Bud of Harmony. You will need to acquire 12 Auspice Slivers from Echoes of War battles and 3 million credits. That is a lot of money, but Mydei's tricks will be very powerful!
It does not come overnight, therefore begin early by winning the appropriate battles. It is similar to accumulating riches to dress your hero.
Mydei's Kit
His Battle Movements Mydei's kit is what he does during battle. Think of it as his tricks box. Below is what he can do:
Basic Attack (Vow of Voyage): He attacks and deals Imaginary damage to a single target for 25% of his attack. Basic but effective.
Skill: Mydei loses it here. He spends half of his remaining HP to attack a single target for Imaginary damage worth 90% of his HP and 50% to all targets around him. If he doesn't have enough HP, he falls to 1 HP.
Ultimate: Mydei Imaginary damages an enemy (160% of maximum health) and nearby enemies (100% of maximum health).
Talent: At 100 Charge for Mydei's Charge, he goes into special "Vendetta" mode. He is healed (25% recovered), his max health is boosted by 50%, and he has boosted movement speed in combat.
Mydei's kit is a combination of power and health. He's attack-lion-like but has to be handled with care.
His kit, although already powerful, requires a lot of time to max out. One way, often overlooked is- to buy Honkai: Star Rail Oneiric Shards to speed things up. They provide a quick option to max Mydei's already powerful kit.
Eidolons - More Power Through Copies
Eidolons are rewards that you receive if you collect additional Mydeis through game banners. They are all utilized for the sole purpose of powering him up. What they do:
E1 (Frost Hones Spine of Steel): His "Godslayer Be God" deals damage to the primary target 30% more and damages all enemies without difference. Great for parties!
E2 (Strife Beholds Cry of Dead): Mydei in Vendetta oversees 15% of the enemy team's defense, and healing converts 40% into Charge (up to 40 points). Thus, he can attack more frequently.
E3 (Honor Exalts Feast of Faith): Raises his Skill by 2 and Basic Attack by 1. Handy but unsophisticated.
E4 (Siren Jolts the Laconic Lion): In Vendetta, he gets 30% extra critical damage and healing for 10% of his max health when hit. It prolongs his survival.
E5 (War Chisels Flesh of Flame): Increases his Talent and Ultimate by 2 levels. Minor boost for epic battles.
E6 (Legacy Scales Mound of Blood): Mydei will start battles in Vendetta, and "Godslayer Be God" has only 100 Charge. He's a wrecking ball immediately! Eidolons make Mydei more difficult and more lethal. Even E1 or E2 would be enough to change his fighting style, but E6 is the jackpot.
How to Play Mydei Well?
Now that you've learned his moves and boosts, here's how you employ Mydei in battle. He's a main damage dealer, so keep him on the damage train. Provide him with loads of health - 8,000 or so - is a good baseline - because his damage is in proportion. Provide him with critical rate (90% is the best) and critical damage so his attacks are impactful. Speed (around 134) causes him to attack more.
Mydei's optimal equipment is the Scholar of Lost Erudition relics for Skill damage and Bone Collection's Serene Demesne ornaments for health and crit boosts. His special weapon, "Flame of Blood, Blaze My Path," is perfect - it increases health and damage when he drops it. If you're short on resources, you can buy Honkai: Star Rail Oneiric Shards to speed things up- just a shortcut, and an efficient one, to get Mydei's powers to the best they can get.
Conclusion
Why Mydei Rocks Mydei is a star in Honkai: Star Rail because he combines danger and power in a playful manner. Leveled up with the proper materials - such as Borisin Teeth and Fear-Stomped Flesh - he can be a tank and a destroyer. His kit, replete with health-sucking attacks and unstoppable Vendetta state, is a thrill in every fight. Eidolons give him even more oomph, making him a legend if you gather all of them. Crush bosses or waves, Mydei's a fearless choice who rewards fearless players. Get his gear, master his moves, and let him lead your party to victory!
