Quick Breakdown: Obsidian Codex vs Marechaussee Hunter
Obsidian Codex? 2-Pc gives +15% DMG while in Nightsoul's Blessing; 4-Pc ramps up CRIT Rate by 40% for 6s after spending one Nightsoul point (once per second). Marechaussee Hunter offers 2-Pc +15% N/CA DMG, and its 4-Pc stacks +12% CRIT Rate per HP change (caps at 36%, lasts 5s per stack). In 6.0's S-Tier scene, Obsidian fits Kinich, Mualani, Chasca, and Mavuika perfectly; Marechaussee powers Neuvillette, Wriothesley, Gaming, and Lyney. Oh, and Obsidian's Flower runs HP from Lv0-20: 717-4780, with subs like 2.7-3.9% CRIT Rate or 5.4-7.8% DMG.
Nightsoul-heavy teams? Go full Obsidian 4-Pc.
HP-drain comps? Marechaussee 4-Pc all the way.
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Digging into the Set Effects
Obsidian Codex: That 2-Pc +15% DMG kicks in during Nightsoul's Blessing; 4-Pc drops 40% CRIT Rate right after you burn a Nightsoul point. Main pieces? Flower (HP), Plume (ATK), Sands (HP%, ATK%, or ER). It sings with Kinich's full Nightsoul synergy—pure fireworks.

Marechaussee Hunter: 2-Pc pumps N/CA DMG by 15%; 4-Pc builds 36% CRIT Rate through HP fluctuations. Pieces mirror the usual: Flower (HP), Plume (ATK), Sands (HP% or ATK%). Wriothesley's N3C rotations? Chef's kiss for triggering it.

Hit the domain at AR45+ for 1 5-star every 20 Resin.
Use +0 fodder (gives 80% EXP); level to +16 before pushing +20.
Always chase Flower and Feather with two CRIT subs—game-changer.
Stat Priorities and Substat Goals
For Obsidian, prioritize CRIT DMG > CRIT Rate/ER/ATK%/HP%. Sands? HP%, ATK%, or ER. Goblet takes Elemental DMG; Circlet, CRIT DMG. Subs shine at CRIT DMG 5.4-7.8%, ER 4.5-6.5%—percentages beat flats every time.
Marechaussee flips it: CRIT DMG/ATK% > CRIT Rate/ER. Neuvillette loves HP% Sands; Wriothesley, ATK%. Shoot for 70-85% CRIT Rate (that's 36% from the set plus 40-50% from subs).
Reroll every 4 levels—no mercy.
Genshin Optimizer sweet spot: 70-85% Rate, +15-20% CRIT DMG.
Top Characters That Thrive on Each
Obsidian is BiS for Kinich (CRIT DMG on Goblet/Circlet, ER Sands), Mualani (CRIT Rate focus), plus Chasca, Mavuika, Varesa, and Ifa as CRIT DMG mains.

Marechaussee owns Neuvillette (HP% Sands, Hydro Goblet, CRIT DMG Circlet, 110-160% ER—Prototype Amber for F2P folks), Wriothesley (ATK% Sands, Cryo Goblet, 100-125% ER on N5C), Gaming, Lyney, and even Xiao.

Kinich setup: CRIT DMG Goblet/Circlet, ER Sands.
Neuvillette: HP% Sands, Hydro Goblet, CRIT DMG Circlet.
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Raw Damage Showdown
Obsidian's 40% CRIT Rate pushes Kinich to 76-86% total in Nightsoul bursts. Marechaussee's 36% CRIT Rate +15% N/CA edges out Heart of Depth (15% Hydro +30% post-Skill) or Blizzard Strayer (40% vs. frozen). Hit optimal 75% Rate/150% DMG; Marechaussee holds 76-86% at 100% uptime.
Marechaussee beats Blizzard universally—no freeze required.
(Editor's take: Always sim in Genshin Optimizer; prioritize CRIT DMG once Rate's locked.)
Farming Smarts: Domains and Efficiency Tips
Obsidian drops from Sanctum Of Rainbow Spirits (AR45+, co-drops Fragment Of Harmonic Whimsy and Unfinished Reverie).

Marechaussee? Denouement Of Sin (Mystic Offering trades 3:1 for 5-stars, co-drops Golden Troupe).

+0 fodder across the board; +16 before +20.
Flower/Feather: Two CRIT subs. Sands/Goblet/Circlet: Right main stat + one CRIT.
20 Resin per run; sacrifice 5-stars at 3:1.
So, Which to Farm First? Your Decision Tree
Prioritize Obsidian for Natlan Nightsoul stars like Kinich and Mualani—Sanctum first. Marechaussee for HP drain or N/CA beasts like Neuvillette—Denouement awaits.
Nightsoul teams scream Obsidian 4-Pc. HP manip? Marechaussee.
Dodge CRIT Rate overcaps; subs often net 15-25% more than full 4-Pc.
Roster check: Natlan mains? Sanctum. 30+ characters? Marechaussee.
Optimizer is your bible.
Mixes and Backup Plans
2+2 combos: Pair Marechaussee 2-Pc with Crimson Witch, Blizzard, or Heart; Obsidian 2-Pc with Nod-Krai. Marechaussee's 36% CRIT trumps Heart/Blizzard universally. Obsidian stays mono-Natlan—future-proofs for 5.0+ Nightsoul.
Obsidian 2-Pc + ATK% pieces on Chasca? Solid.
Test in Abyss sims before committing.
FAQ
What even is Obsidian Codex?
2-Pc +15% DMG in Nightsoul's Blessing; 4-Pc +40% CRIT Rate after spending a point. Farm it at Sanctum Of Rainbow Spirits.
Prime domain for Marechaussee Hunter?
Denouement Of Sin—1 5-star/20 Resin at AR45+, Mystic Offering 3:1, co-drops Golden Troupe.
Who rocks Obsidian Codex best?
Kinich, Mualani, Chasca, Mavuika, Varesa (Nightsoul DPS—CRIT DMG mains).
Marechaussee substats priority?
CRIT DMG > Rate/ATK%/ER/HP%; target 70-85% Rate, % over flat.
Obsidian or Marechaussee?
Obsidian for Natlan Nightsoul (40% CRIT). Marechaussee for universal HP drain (36% CRIT).
Obsidian farming hacks?
Sanctum Of Rainbow Spirits; +0 fodder, CRIT subs on Flower/Feather.
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