Honkai: Star Rail Complete Relic Farming & Substat Optimization Guide

In the endgame ecosystem of HoYoverse’s turn-based galactic odyssey Honkai: Star Rail (HSR), no system exerts a greater influence over your account’s combat efficacy than Relics. While pulling five-star banner characters and ascending signature Light Cones provides an indispensable statistical foundation, it is the labyrinthine RNG of four-piece Cavern Relic sets and two-piece Planar Ornament sets that dictates whether your teams comfortably dismantle Memory of Chaos Floor 12 and Pure Fiction Stage 4, or collapse under crushing damage deficits.

Yet for millions of Trailblazers, Relic farming is also the single most demoralizing sinkhole of daily stamina. Spending weeks burning hard-earned Trailblaze Power inside Caverns of Corrosion only to roll flat Defense and flat HP substats on a Crit Rate body piece is an agonizing rite of passage.

This comprehensive masterclass cuts through the randomness. Drawing on mathematical modeling, statistical drop-rate telemetry, and endgame testing across version updates, this guide provides an authoritative roadmap to maximizing your stamina return-on-investment, prioritizing Self-Modeling Resin, and building unshakeable roster carry units.

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1. The Mathematical Reality: Relic Drop Rates & Upgrade Odds

To farm efficiently, you must understand the underlying probabilistic odds governing the Omni-Synthesizer and Cavern rewards:

Primary Drop Probabilities:

• Trailblaze Power Cost: 40 Power per Cavern of Corrosion run guarantees 2 to 3 Gold (5-Star) Relics at Equilibrium Level 6.
• Main Stat Distribution: Certain main stats feature dramatically lower drop odds than others. While Flat HP and Flat ATK are heavily weighted on Head and Hands pieces (100% fixed), Body and Sphere pieces are heavily skewed toward defensive attributes:
  • Energy Regeneration Rate Rope: ~5.1% drop rate.
  • Speed Boots: ~10.4% drop rate.
  • Crit Rate / Crit DMG Body: ~9.8% drop rate each.
  • Specific Elemental DMG Boost Spheres: ~9.2% split across all damage types.

Relic Main Stat Scarcity Hierarchy (Hardest to Easiest to Farm):
[1. Energy Regen Rate Rope (5.1%)]
  └──> [2. Specific Elemental DMG Sphere (9.2%)]
        └──> [3. Crit Rate / Crit DMG Body (9.8%)]
              └──> [4. Speed Boots (10.4%)]
                    └──> [5. Outgoing Healing / Effect Hit Rate (~12%)]
                          └──> [6. ATK% / HP% / DEF% Main Stats (~25-30%)]

Knowing these statistical weights is critical: never burn custom crafting resources on slots that drop frequently.

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2. Cavern Efficiency: The “Universal Value” Rule

The number one mistake casual players make is hyper-focusing on farming a hyper-specific, niche Cavern of Corrosion that yields one good set and one completely useless set.

Stamina efficiency in Honkai: Star Rail dictates that you should prioritize Caverns where BOTH relic sets provide high utility across multiple roster archetypes:

Tier S: Maximum Account Efficiency Caverns

1. Path of Elixir Seekers (The Alchemy Commission):
   • Messenger Traversing Hackerspace (2pc Spd +6%): Universally viable on virtually every harmony buffer, debuffer, and abundance healer in the entire game (Sparkle, Bronya, Ruan Mei, Tingyun, Huohuo).
   • Longevous Disciple (2pc HP +12%, 4pc Crit Rate up to 16%): Core BiS (Best-in-Slot) for HP-scaling hypercarries (Blade, Clara) and excellent 2pc survival utility.
2. Path of Cavalier (Penacony):
   • Pioneer Diver of Dead Waters: BiS for debuff-centric hypercarries (Acheron, Dr. Ratio, Silver Wolf).
   • Watchmaker, Master of Dream Machinations: Fundamental gear for Break Effect enablers (Harmony Trailblazer, Ruan Mei, Gallagher).

Golden Rule: Avoid the Path of Gelid Wind (Hunter of Glacial Forest / Eagle of Twilight Line) during early account development unless you are explicitly building an advanced zero-cycle Eagle-action-advance strategy. The Ice set is excessively narrow compared to Messenger or Pioneer.

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3. Planar Ornament Farming: Simulated Universe Strategies

Planar Ornaments (Sphere and Rope) require clearing Worlds in the Simulated Universe / Divergent Universe for 40 Trailblaze Power or 1 Immersifier token.

Priority Planar Sets for Meta Accounts:

• Broken Keel (World 7): Requires 30% Effect RES to grant +10% Crit DMG to the entire team. Crucially, Broken Keel stacks multiplicatively. Equipping three support units with Broken Keel grants your main DPS a permanent +30% Crit DMG aura while making your supports impervious to crowd control freezes and stuns.
• Rutilant Arena (World 7): Grants 8% Crit Rate and boosts Basic ATK/Skill DMG by 20% once 70% Crit Rate is reached. Premium pick for Dan Heng IL, Jingliu, and Blade.
• Duran, Dynasty of Running Wolves (Penacony Divergent Universe): Extraordinary scaling set for follow-up attack teams (Feixiao, Topaz, Robin, Aventurine), granting up to 25% follow-up damage and 25% Crit DMG.

Because World 7 pairs Broken Keel with Rutilant Arena, it remains the single highest-value Simulated Universe destination for stamina expenditure.

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4. Self-Modeling Resin: Strict Priority Guidelines

Self-Modeling Resin is the rarest crafting material in the game, allowing you to synthesize any specific 5-star Relic with your exact choice of Main Stat. Because it is strictly rationed (awarded via Nameless Honor and limited flagship events), wasting it on suboptimal pieces is a catastrophic account setback.

Synthesis Priority	Recommended Piece	Target Main Stat	Justification
Priority 1 (Crucial)	Planar Link Rope	Energy Regeneration Rate (ERR)	ERR ropes possess the lowest drop probability in the game (~5%) and are mandatory to hit crucial 3-turn and 4-turn ultimate rotations on supports like Robin, Tingyun, and Huohuo.
Priority 2 (High)	Planar Sphere	Elemental DMG Boost	Matching the correct element on a specific domain set is mathematically brutal; crafting bypasses dozens of wasteful SU runs.
Priority 3 (Medium)	Cavern Feet	Speed (SPD)	Required to hit speed tuning breakpoints (134, 143, 160.1 SPD) across turn-manipulation Harmony units.
NEVER CRAFT	Head / Hands	Flat HP / Flat ATK	Fixed main stats; synthesize these exclusively with basic Relic Remains.

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5. Speed Tuning & Breakpoint Thresholds

In Honkai: Star Rail, speed is not a continuous linear progression; it operates on discrete turn-action value intervals known as Speed Breakpoints:

• 120 SPD: Activates secondary utility bonuses on planar sets (e.g., Space Sealing Station, Fleet of the Ageless).
• 134.4 SPD (The Gold Standard): Grants two actions in the first cycle of Memory of Chaos, and an extra action in the third cycle. Every support and non-hyperspeed DPS should aim for 134 SPD as an absolute baseline.
• 143.4 SPD: Grants an extra action in cycle 2; outstanding for offensive debuffers (Pela, Silver Wolf).
• 160.1 SPD (Hyperspeed): Grants two actions per cycle for multiple consecutive cycles; the premier threshold for dedicated action-advance supports (Sparkle, Bronya).

Action Value Formula: 
AV = 10,000 / Character Speed
- At 100 SPD: Action takes 100 AV (1 turn per 100 AV cycle)
- At 134 SPD: Action takes 74.6 AV (Allows 2 complete turns in Cycle 1's 150 AV limit)
- At 160 SPD: Action takes 62.5 AV (Allows 2 complete turns in Cycle 1, and 4 turns across 250 AV)

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6. The Salvage vs. Leveling Economy

Managing your inventory of purple (4-star) and unwanted gold (5-star) relics dictates how many synthesis attempts you can fund:

1. Salvage All 5-Star Duds into Relic Remains: Never use gold relics as raw XP fodder. Salvaging gold relics yields 10 Relic Remains each. Ten gold relics yield 100 remains—the exact cost to synthesize a brand-new targeted relic piece in the synthesizer.
2. Use 4-Star and Below for Relic EXP: Channel blue and purple relics into Lost Crystals and enhancement fodder.
3. The +3 and +6 Threshold Test: When a gold relic drops with three substats including one good roll (e.g., SPD or Crit Rate), upgrade it to +3 or +6 immediately. If the fourth unlocked substat or the first upgrade roll misses your desired stat, stop upgrading and feed it to another candidate piece. Feeding an upgraded relic transfers 80% of its accumulated EXP, minimizing wasted resources.

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Summary Checklist for Maximum Account Progress

• Lock In 134 SPD First: Prioritize hitting 134.4 SPD on your primary supports before stressing over micro-optimizing hypercarry crit ratios.
• Camp High-Yield Caverns: Farm Path of Elixir Seekers (Messenger) and Path of Cavalier (Pioneer) for broad account utility.
• Reserve Self-Modeling Resin Exclusively for ERR Ropes and Elemental Spheres.
• Standardize on World 7 (Broken Keel / Rutilant Arena) for Planar Farming.
• Salvage 100% of Defective 5-Star Relics into Relic Remains for Targeted Synthesis.

By adhering to this disciplined mathematical blueprint, you will escape the stamina trap, build high-performance endgame rosters, and conquer the most demanding seasonal challenges the Astral Express has to offer.