HSR 3.7: Phainon Crushes Mydei on Boss 4 King with CRIT DMG Body

Diving into Anomaly Arbitration Boss 4 in 3.7

You unlock Anomaly Arbitration after grabbing full stars in Memory of Chaos Stage 12, Pure Fiction Stage 4, and Apocalyptic Shadow Diff 4. It throws 3 Knights at you plus the King (Boss 4). Nail all 6 Knight stars for that sweet Self-Modeling Resin—and yeah, clearing Knights first makes the King way less of a nightmare.

King's got phases: Sublime, Radiant, and Avatar of the Sky, where it summons 2 Daythunder Ravens. Key traits? Energy Absorption (drains -2 Energy per hit unless you're maxed, +10 on kills); Sunder (0.8% Max HP per stack, but shields or heals dispel it). Stick to Physical or Wind elements. Buffs to chase: Sanguine Vitality (+50% CRIT DMG, +60% Max HP); Power Surge (+80% Basic/Skill/Ult DMG, +2000 ATK); Fluid Dash (+40% DoT RES PEN, +30% SPD).

Blitz the Knights early. Knight 1? Phainon/Cyrene/Cerydra/RMC—they shrug off CC. Time your Physical hypercarries for those buffs. Test runs in MoC, PF, or AS first. Phainon's banner hits Phase 2 Nov 25-Dec 16, 2025; Phase 1 Nov 5-26, 2025. Mydei's in Phase 2. Relic Recon drops Nov 5-Dec 15, 2025 (Trailblaze Lv 21+), so farm those CRIT/ATK stats hard.

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Phainon: The Physical Beast You Need

Phainon, our 5-star Physical Destruction powerhouse, flips the script at 60% base SPD. Hit Ult with 12 Coreflame stacks (max 15), and boom—transforms into Khaslana for 8 Extra Turns. Stacks build fast: Skill (+2), targeting (+1 +30% CRIT DMG), ally Energy (+1), post-transformation (+3). His Territory? Enemies snag Physical Weakness and start with +4 Bruises (max 7).

Basic hits 250% single-target +75% adjacent Physical, slapping +2 Bruises. Skill adds Bruises equal to enemy count, plus +1 Soulscorch (-75% DMG received). Big Skill? Per Bruise, it's 4x45% ATK (up to 1170% at 7), and at 4 Bruises, +450% ATK to all. Sustain's no joke: CC immune, 20% Max HP heal per attack, survives one fatal hit at 25% HP (+80% ATK +270% Max HP after).

In 3.7 rankings, he's #5 (E2 minimum), smokes Mydei (#7) on Physical King Buff1—Power Surge loves his kit.

Build it right: Body CRIT DMG/Rate; Feet SPD (134+); Orb ATK%/Physical DMG%; Rope ATK%. Subs: CRIT DMG/Rate > SPD > ATK%. Relics: Wavestrider Captain (2Pc +16% CRIT DMG, 4Pc +48% ATK Ult snapshot). Planars: Arcadia of Woven Dreams (+27-36% DMG), Rutilant Arena (+20% Basic/Skill at 70% CRIT Rate). Light Cones: Thus Burns the Dawn (+12-20% SPD, ignore 18-36% DEF, post-Ult +60-132% DMG); F2P pick On the Fall of an Aeon (+8-16% ATK x4).

Playstyle:

1. Get allies like Sunday/Bronya pulling targeting/Energy/Action Advance to 12 stacks quick.
2. Transform. Alternate Basic (Bruises) and Skill.
3. Unleash Big Skill at 4+ Bruises.
4. Max traces: Bide in Flames (+45% DMG ally heal/shield), Shine with Valor (+50% ATK x2).

(Quick editor note: Phainon's that rare hypercarry who feels rewarding to pilot—once transformed, it's pure fireworks.)

Mydei: HP Tank Turned Nuker?

Mydei, 5-star Imaginary Destruction on HP scaling, thrives on Vendetta from HP loss (bumps Max HP, resets action). Sustain city: taunts, death immunity, Ult heals 20% Max HP +20 Charge (HP=Charge 1:1, cap 200). Hit 100 Charge for Kingslayer, 150 for Godslayer. Aim for 8000-12k+ HP.

Synergies shine in Knights (Knight 1: Mydei/Cyrene/Tribbie/Hyacine). But against Phainon? Lower tier in Imaginary meta.

Build: Body CRIT DMG; Feet SPD/HP% (134+); Sphere Imaginary DMG/HP%; Rope HP%. Subs: CRIT Rate/DMG > HP%. Relics: Scholar Lost in Erudition (2Pc +8% CRIT Rate, 4Pc +20% Skill/Ult). Planars: Bone Collection’s Serene Demense (+12% Max HP, +28% CRIT DMG at 5000+ HP), Longevous Disciple (HP/CRIT Rate).

Playstyle:

1. Eat some HP loss to trigger Vendetta.
2. Ult for heal/Charge, push to 150 Godslayer.
3. Traces: Earth and Water (survive lethal), Thirty Tyrants (CC immune), Bloodied Chiton (+48% CRIT Rate at 4000+ excess HP). Priority: Skill > Ult > Talent > Basic.

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CRIT DMG/Rate Bodies Crush ATK% or Break Effect—Here's Why

Data from 3.7 clears shows CRIT DMG/Rate bodies max out Phainon (Physical hypercarry) and Mydei (HP scaler), blowing past ATK% or Break Effect. Stack ATK% on Feet/Rope; Break Effect? Nah, no break focus here.

Phainon: CRIT's king (Sanguine piles +50% CRIT DMG); Power Surge's +2000 ATK handles the rest. Break? Skip it.
Mydei: CRIT first (HP fuels CRIT); drown in HP for Charge/DMG. Break? Not happening.

Hit Relic Recon (Nov 5-Dec 15, 2025) for those CRIT bodies. No SPD Planar? Grab Phainon Physical DMG one.

Ever wonder why CRIT pops off here? Buffs amplify it insanely—ATK% just can't keep up.

Team Comps That Carry King and Knights

For King Buff1: Phainon/Cerydra/Cyrene/Tribbie (Cerydra's meteors shred, Tribbie pens RES). Swap: Phainon/Cyrene/Cerydra/RMC (CC resist locked in).

Knights 1/2: Phainon/Cyrene/Cerydra/RMC (CC immune, stacks fly). Knight 1 alt: Mydei/Cyrene/Tribbie/Hyacine (Charge hammers).

Premium Phainon squad: Phainon/Sunday/Bronya/Robin/Tingyun + Huohuo (Action Advance galore). F2P: Phainon/Remembrance Trailblazer/Tingyun/Lynx.

Mydei flex: Mydei/Cyrene/Tribbie/Remembrance Trailblazer/Sparkle/Sunday + Hyacine/Huohuo. F2P: Mydei/Pela/TB-Remembrance/Bronya/Gallagher.

Optimization tips:

1. Wipe 3 Knights with Phainon squads—King becomes a joke.
2. Sunday amps Phainon (+20% Physical RES PEN E2).
3. 134+ SPD Phainon outpaces Bronya/Sunday cycles.

Eidolons, Rankings, and Why They're Endgame Staples

3.7 meta: Phainon #5 (E2S0 floor, E2 > E6S1); Mydei #7 (skip unless your Imaginary team's starving). Phainon E2: +20% Physical RES PEN, 4 Bruises Verdict +1 Extra Turn. E6: Unlimited Coreflame +36% True DMG. Mydei E1: +30% Godslayer AoE; E2's the chase.

Phainon's Physical King viable at E0 (high floor), but low ceiling without E2.

Pull advice: E0S1 for casual spins; E2S1 if you're invested. Steer clear of E0 sans sustain—it's rough.

Playstyles, Common Traps, and Quick Fixes

Phainon: Stack to trans-nuke. Feet SPD (134+) > ATK%. Trap: E0 feels squishy—fix with Sunday/Bronya.

Mydei: HP loss procs Vendetta, Ult sustains. No plug-and-play King team. Trap: HP bleed—Gallagher/Hyacine to the rescue.

Test like this:

1. CRIT body, 134+ SPD.
2. Knights to King; watch Bruises/Charge.
3. Subs: CRIT > ATK/HP/SPD.

(Editor take: I've farmed this mode dry—Phainon's E2 transform still gives me chills every clear.)

FAQ: Your Burning Questions Answered

CRIT DMG/Rate over ATK% for Phainon?
Yep—maxes Sanguine/Power Surge. ATK% on Feet/Rope, 134+ SPD mandatory.

Mydei's best body for Boss 4?
CRIT DMG beats HP%/ATK%/Break. Stack 8000-12k+ HP, SPD Feet.

Phainon vs Mydei for endgame clears?
Phainon (#5, E2 min) tops Mydei (#7). Physical King hypercarry wins.

Top relics in 3.7 meta?
Phainon: Wavestrider 4Pc, CRIT/SPD. Mydei: Scholar Erudition, CRIT/HP.

Phainon team for Boss 4?
Phainon/Cerydra/Cyrene/Tribbie on Buff1; F2P Remembrance TB.

Biggest pitfalls?
E0 Phainon struggles; Mydei needs sustain. E2 Phainon, Knights first—always.