Mydei 3.7 Rerun Guide: Best Build & Team Comps for HSR

Mydei's back in Honkai Star Rail's 3.7 Phase 2 banner (November 25 - December 16, 2025) as a premier Imaginary Destruction DPS. This guide covers optimal relic configurations, speed tuning calculations, team synergies, and advanced optimization strategies to maximize his HP-scaling damage potential and Vendetta state mechanics.

Author: BitTopup Publish at: 2025/11/11

Mydei 3.7 Rerun Overview: Character Analysis & Meta Position

Here's the thing about Mydei – he's not your typical DPS character. This 5-star Imaginary Destruction unit completely flips the script on damage dealing through HP consumption mechanics. His Talent Blood for Blood generates 1 Charge per 1% HP lost, capping at 200 Charge. Hit 100 Charge? Welcome to Vendetta state, where he restores 25% HP while gaining +100% action forward, +50% Max HP, and – here's the wild part – his DEF drops to 0.

Forget everything you know about ATK scaling. Mydei's damage scales entirely on Max HP. His Ultimate Throne of Bones delivers 160% Max HP damage in a Blast pattern with 2-turn taunt (because apparently he enjoys taking hits). Godslayer Be God activates at 150 Charge, unleashing 280% Max HP damage to the primary target plus 168% to adjacent enemies with an extra turn thrown in for good measure.

Mydei character from Honkai Star Rail showing his official design

The Bloodied Chiton trace? That's where things get interesting – up to 48% CRIT Rate at 8000+ HP, which dramatically reduces your substat requirements.

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Community ratings tell the story: SS-tier in Memory of Chaos with 2413 votes, S+ in Pure Fiction, and S in Apocalyptic Shadow. His taunt mechanics and Blast-focused AoE do create some limitations in wave-clearing compared to dedicated AoE specialists, but that's honestly a minor trade-off.

Optimal Relic Main Stats Priority Guide

Let's talk CRIT DMG body pieces – they're your best friend here. With that 48% built-in CRIT Rate from Bloodied Chiton at 8000+ HP, you're already sitting pretty. Throw in Sunday's +20% CRIT Rate and Scholar Lost in Erudition's +8%, and you're looking at 76-81% CRIT Rate without even touching body investment. HP% body pieces? Only consider them if you're pushing extreme builds beyond 12,000 HP.

Honkai Star Rail relic equipment interface showing optimal main stats for Mydei build

SPD main stats on feet unlock the 134 SPD breakpoint for 2 bonus turns in cycles 1 and 4 across 5-cycle rotations. You'll need roughly 25 SPD from substats beyond base SPD feet to hit this sweet spot. HP% feet work for slow builds, but honestly? The action value benefits from 134 SPD usually outweigh the HP gains.

Imaginary DMG% spheres provide 43.2% damage amplification across all abilities, scaling multiplicatively with HP-based calculations. HP% spheres become competitive when your total HP approaches 10,000+, but that's getting into whale territory. HP% link ropes are your go-to for highest damage scaling – they directly increase all ability multipliers while contributing to those crucial Bloodied Chiton thresholds.

Advanced Speed Tuning Calculations

The 134 SPD breakpoint isn't just a number I'm throwing around – it provides 2 bonus actions across 5-cycle rotations using the Action Value formula: AV = 10000/SPD. At 134 SPD, Mydei achieves AV 74.6, translating to 40% more actions over extended encounters. Higher breakpoints at 143 SPD (AV 69.9) and 146 SPD (AV 68.5) require significant substat investment with diminishing returns – not worth the headache for most builds.

Sunday teams require -1 SPD tuning. Position Mydei 1 SPD below Sunday for synchronized double actions. With Sunday at 160 SPD, Mydei targets 159 SPD for immediate follow-up turns. Bronya teams use similar principles with 100% action advance, typically targeting 130-135 SPD.

Here's your calculation: Base SPD + Feet Main Stat + Substat Rolls. With base 95 SPD and +25 SPD feet, hitting 134 SPD requires 14 SPD from substats across 6 pieces – that's averaging 2.3 SPD per piece. Cyrene provides +8% team SPD, reducing required base SPD by approximately 11 points (which is honestly a nice quality-of-life improvement).

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Complete Relic Set Recommendations

Scholar Lost in Erudition takes the crown for optimal 4-piece configuration. You get +8% CRIT Rate (2-piece) and +20% Skill/Ultimate DMG plus +25% next Skill DMG after Ultimate (4-piece). This synergizes beautifully with Mydei's Skill-focused rotation and Ultimate-to-Skill combos in Vendetta state.

Scholar Lost in Erudition relic set from Honkai Star Rail with set bonuses displayed

Longevous Disciple offers +12% Max HP (2-piece) and +8% CRIT Rate per hit/HP consumption up to 2 stacks for 2 turns (4-piece). While it provides HP scaling and CRIT Rate stacking, the conditional nature makes it less consistent than Scholar's reliable bonuses. I've seen too many players struggle with the uptime requirements.

2-piece Scholar + 2-piece Longevous balances CRIT Rate (+8%) with HP scaling (+12%) for transitional builds. Alternative combinations include Scholar + Wastelander for +8% CRIT Rate and +10% Imaginary DMG – solid if you're still farming pieces.

Bone Collection's Serene Demesne represents the premium ornament choice with +12% Max HP and +28% CRIT DMG when Max HP ≥5000. Rutilant Arena provides +8% CRIT Rate and +20% Basic/Skill DMG when CRIT Rate ≥70% – easier to activate but less impactful.

Team Composition Strategies & Synergies

Premium Hypercarry setup: Mydei, Sunday, Tribbie, Luocha. This achieves 0-1 cycle Memory of Chaos clears with E2+ investment. Sunday provides 100% action advance and CRIT buffs, Tribbie contributes 24% RES PEN and HP-scaling amplification, Luocha ensures healing for HP management. It's expensive but devastatingly effective.

Honkai Star Rail premium team composition featuring Mydei, Sunday, Tribbie, and Luocha

F2P Hypercarry: Mydei, Remembrance Trailblazer, Pela, Lynx achieves 85-90% of premium performance. Trailblazer provides CRIT DMG buffs and action advancement, Pela contributes 40% DEF shred, Lynx offers Max HP buffs and aggro management. Honestly? This team punches way above its weight class.

Sunday represents optimal Harmony support with 100% action advance, CRIT Rate/DMG buffs, and SP management. Bronya offers similar benefits with DEF ignore and cleansing. Tribbie provides specialized HP-scaling support with 24% RES PEN – she's basically made for characters like Mydei.

Light Cone Tier List & Analysis

Flame of Blood, Blaze My Path (signature) provides +18-30% Max HP and +20-40% Incoming Healing. The passive consumes 6-8% Max HP when using Skills/Ultimate, granting +30-50% DMG with additional +30-50% if consuming 500+ HP. At S5, it reaches 60% total damage bonus – absolutely bonkers numbers.

Flame of Blood, Blaze My Path light cone from Honkai Star Rail showing weapon stats and abilities

The Unreachable Side offers premium 4-star performance with +18-30% CRIT Rate and Max HP, plus +24-40% DMG on HP consumption. Ninja Record - Sound Hunt provides F2P performance with +12-24% Max HP and +18-36% CRIT DMG when HP changes, available through Herta Store (thank goodness for accessible options).

Ninja Record provides 80% of signature effectiveness at S5 refinement while remaining F2P accessible. Standard Destruction weapons should be avoided due to ATK scaling conflicts – they're basically useless for Mydei.

Eidolon Priority & Investment Guide

E1 provides exceptional value with +30% Godslayer DMG and AoE extension to full multiplier damage, transforming adjacent damage from 168% to 280% Max HP. That's a massive upgrade for multi-target scenarios.

E2 offers 15% DEF ignore in Vendetta state plus 40% healing-to-Charge conversion, representing the optimal stopping point for most players. The efficiency here is just too good to pass up if you're investing seriously.

E4 contributes +30% CRIT DMG in Vendetta and +10% HP when taking attacks but offers less efficiency than E1-E2. E6 enables starting battles in Vendetta state and reduces Godslayer trigger to 100 Charge, creating 0-cycle potential – whale territory, but undeniably powerful.

F2P players should target E0S1 over E1S0 for optimal resource allocation. Moderate spenders benefit from E2S1 as the optimal balance point. Whale players pursuing maximum performance should target E6S5 (obviously).

Advanced Optimization Techniques

HP% substats receive highest priority (★★★) targeting 8000+ total HP. CRIT Rate substats maintain high priority (★★★) targeting 90-100% total including team buffs. SPD substats receive moderate priority (★★) for 134+ SPD breakpoints. CRIT DMG provides consistent value (★★) with diminishing returns beyond 200%.

The damage formula: Base Damage = Skill Multiplier × Max HP × (1 + DMG Bonuses) × CRIT Multiplier × DEF Multiplier × RES Multiplier. Godslayer calculation at 8000 HP with 200% CRIT DMG: 280% × 8000 × (1 + DMG%) × 3.0 × DEF × RES. Simple math, devastating results.

Advanced builds utilize damage calculators for substat allocation across multiple pieces simultaneously – it's worth the time investment. Speed tuning optimization considers team rotation timing and buff synchronization. Relic efficiency analysis compares upgrade costs against performance gains (because materials aren't infinite).

Endgame Performance & Future Viability

Mydei achieves SS-tier Memory of Chaos rating with exceptional single-target damage. E2S1 builds demonstrate 0-1 cycle clear potential with 1M+ Ultimate damage under optimal conditions. Speed-tuned teams achieve consistent sub-5 cycle clears across most floors – that's competitive with the best DPS units in the game.

Pure Fiction performance reaches S+ tier despite taunt mechanics limitations. Enhanced AoE from E1 significantly improves wave-clearing efficiency. Multi-target scenarios benefit from Godslayer's enhanced coverage.

HP-scaling mechanics align with emerging meta trends throughout the 3.x patch cycle. Investment recommendations favor E2S1 as a future-proof stopping point, ensuring competitive performance while preserving resources for upcoming characters.

FAQ

Is Mydei worth pulling in the 3.7 rerun banner? Absolutely, especially if you're lacking strong Imaginary DPS. SS-tier Memory of Chaos performance and unique HP-scaling mechanics make him a solid long-term investment. E0S1 provides competitive performance without breaking the bank.

What are optimal relic main stats for Mydei? Body: CRIT DMG, Feet: SPD, Sphere: Imaginary DMG%/HP%, Rope: HP%. Target 8000+ HP, 90-100% CRIT Rate, 134+ SPD for breakpoints. Pretty straightforward once you know the priorities.

How do I calculate Mydei's speed tuning? Target 134 SPD for 2 bonus turns in 5-cycle rotations. Formula: 95 base + 25 feet + substats. With Sunday teams, set Mydei 1 SPD below Sunday for perfect synchronization.

Which team compositions work best? Premium: Mydei/Sunday/Tribbie/Luocha. F2P: Mydei/Remembrance Trailblazer/Pela/Lynx. Focus on action advancement and HP management – both setups work incredibly well.

What light cone should I use for Mydei? Signature Flame of Blood, Blaze My Path is optimal. F2P option: Ninja Record - Sound Hunt from Herta Store provides 80% signature effectiveness – honestly impressive for a free weapon.

How does Mydei perform in endgame content? SS-tier Memory of Chaos, S+ Pure Fiction, S Apocalyptic Shadow. His unique survival mechanics provide consistent performance across varied content types – he's remarkably versatile for a specialized character.

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