Honkai: Star Rail · Progression guide

Honkai: Star Rail Relics — Should You Craft, Reroll or Keep Farming?

Start with the piece you would replace and the problem you need it to fix. If you need an Energy Regeneration Rate Rope to get an Ultimate out on turn three, a better roll on an ATK Rope cannot give it that main stat. If the right piece is already equipped, compare the reroll with the actual build you have today.

Quick answer · Our advice

Craft if a specific slot, main stat or selected substat would solve a known problem. Consider a die when the correct piece already has the substats you need and better enhancement allocation could improve the equipped build. Farm when the same reward pool can improve several slots or characters.[1][2][4][6]

View active Honkai: Star Rail codes

By GachaLootGuide reviewed November 9, 2026

Global Version 4.6. Uses the unified Resin system documented in 3.5 and the optional Interference Key documented in 3.6. Verify the live synthesis or reroll preview before spending.

Choose the tool that can fix your Relic

Version 3.5 combined Wishful Resin into Self-Modeling Resin. In Customized Synthesis, one Resin selects the main stat where customization is available. HoYoverse lists two Resin total for the main stat and one substat, or five total for the main stat and two substats.[2][3][1]

Variable Dice reroll the enhancement distribution of a fully enhanced five-star Relic. The named substats stay on the piece, but their values and upgrade counts can change. You can keep the previous result. An optional Interference Key blocks upgrades to one selected substat during that reroll.[4][5][6]

Our suggested checks

Swipe across the table to see all columns.

Choose the tool that can fix your Relic comparison
What is missing today	First route to compare	What you still need to check
Correct slot and main stat	Craft the exact piece	Set bonus and whether the main stat alone fixes the build
One named substat on a piece you are crafting	Price one selected substat	The line is chosen at synthesis; its later upgrades can still vary
Useful existing substats with weak enhancement allocation	Preview a die on the eligible +15 piece	New distribution and final build thresholds
Several acceptable upgrades in one reward pool	Farm with a defined budget	Which sets and slots can improve the roster
The equipped build already meets the target	Keep it and compare a different slot or teammate	Whether a better-looking piece changes an actual outcome

References[1][2][4][6]

Worked example where crafting an ERR Rope fixes the rotation

Worked example · GachaLoot calculation

A support needs a 110-Energy Ultimate after three Skills

Assumptions

The support has a matching-set ATK Rope equipped. You can craft an ERR Rope from the same Planar set and level it to +15. The set bonus stays active and no lost substat breaks the build’s Speed or survival requirement.
The previous Ultimate returns 5 scalable Energy and the next three Skills give 30 each. There are no hits, kills or fixed grants in this model. The proposed build shows roughly 19.4% ERR and has no other ERR source.
You have four Self-Modeling Resin. The current main-stat-only quote is one. You already meet the other thresholds and need no selected substat.

Energy by turn three with the current ATK Rope5 + 3 × 30 = 95 Energy, short by 15
Energy by turn three with the proposed ERR Rope95 × 1.194 = About 113.43 generated, enough to reach 110
Resin left after the main-stat craft4 − 1 = 3 Resin
Resin left if one substat is also selected4 − 2 = 2 Resin

Result: Craft the main stat under these assumptions. An optional substat does not improve the stated rotation. If the replacement instead needs a particular line to preserve a Speed threshold, compare the two-Resin quote and check how much Speed you need. Choosing the line only guarantees its presence.

Limits of this example: These are hypothetical Energy values and a rounded ERR factor. Use exact kit values, buff timing, Skill Point availability and actual substats for your team. The model compares the third-action budget, not total fight damage.

Mechanic references[1][3][7]

Worked example where a +15 Relic is worth considering for a reroll

Worked example · GachaLoot calculation

A Crit body already has three useful substats

Assumptions

A five-star Crit DMG body has the correct set, four starting substats and five enhancement upgrades. Its lines are Crit Rate, ATK%, SPD and flat DEF. For this build the first three are useful.
The current enhancements landed once on Crit Rate, once on ATK% and three times on flat DEF. One possible preview assigns two to Crit Rate, one to ATK%, two to SPD and none to flat DEF.
You have one Variable Dice and one Interference Key. You are comparing displayed outcomes, with no probability assumed for the preview.

Useful upgrade hits on the original1 + 1 + 0 = 2 of 5
Useful upgrade hits on the example preview2 + 1 + 2 = 5 of 5
Additional useful upgrade hits5 − 2 = 3 more in this hypothetical preview
Key budget if you block flat DEF1 available − 1 spent = 0 Keys left for another piece

Result: This is a reasonable die candidate if the improved stats help a unit you play. A Key would block flat DEF upgrades on this attempt, while the other lines still compete. Compare the actual numbers before accepting. Keep the original if the new result breaks Speed or sends Crit Rate past the point where it helps your build.

Limits of this example: The example counts upgrade hits rather than exact stat values. Individual roll sizes can change. The Key does not remove flat DEF, create a new line or guarantee an upgrade in SPD. A piece that started with three lines normally has one fewer enhancement upgrade after revealing its fourth.

Mechanic references[4][5][6][7]

Worked example where farming can upgrade two characters

Worked example · GachaLoot calculation

Four claims can produce several usable outcomes

Assumptions

You have 160 Trailblaze Power set aside. The selected Cavern shows a cost of 40 per reward claim. One set in the pool can replace your carry’s boots or body, and the other can replace your support’s body.
The three current pieces already let both characters function. You have five Resin and want to reserve three for a separate project. A possible craft for the carry would select the main stat and two substats.

Claims funded by the stated Power budgetfloor(160 ÷ 40) = 4 claims
Separate upgrade targets in this pool2 carry slots + 1 support slot = 3 slots worth reviewing
Resin free for this project5 − 3 = 2 Resin
Gap to the proposed two-substat craft5 − 2 = 3 Resin beyond the free balance

Result: Farm the shared pool within the four-claim budget and compare new pieces with the three equipped baselines. If the support gets an upgrade and only one exact carry slot is still blocking a build, reprice a narrower craft before doing another session.

Limits of this example: Four claims buy four reward attempts, with no promise of the right set, slot or stats. The reserved Resin and the in-game quote are example inputs. Keep enhancement materials outside this Power budget.

Mechanic references[1][7]

What to check before committing Resin or a reroll

Our advice: Write the requirement in terms you can check. Examples include reaching an Ultimate after three actions, keeping the Planar effect active, or surviving the first enemy turn. A general Relic score can rank an attractive piece that misses your actual requirement.
Our advice: Compare totals after the swap, with the same Light Cone, set effects and team buffs. Check the slot, exact main stat and any Speed or Effect Hit Rate threshold. If a displayed value sits right on the line, check the actual combat sequence.[7]
Our advice: Read the final quote and outcome screen. Before crafting, confirm each selected line and the remaining balance. Before rerolling, decide what would qualify as an upgrade and treat the consumable cost as part of the attempt. Keeping the original protects the piece’s stats.[1][4][6]

Star Rail Relic synthesis and reroll questions

Do I still need Wishful Resin for a selected substat?

Version 3.5 merged it into Self-Modeling Resin. HoYoverse lists two total for a main stat plus one substat, and five total for a main stat plus two substats.[2][1]

Can Variable Dice add SPD or change the main stat?

They redistribute upgrades among the existing substats and can change their values. If the piece lacks the stat you need, use a different piece or compare synthesis and farming.[4][5]

Does blocking flat DEF guarantee the Crit or SPD upgrades I want?

An Interference Key blocks enhancements to the one selected line for that attempt. It does not pick which of the remaining lines receives an upgrade.[6]

Should I spend five Resin every time I craft a good piece?

Our advice: Use the least expensive selection that meets the goal. If the main stat alone already fixes the rotation, save the extra Resin for a slot that actually needs specific substats.[1][3]

Sources and review scope

HoYoverse’s Help Center gives the two- and five-Resin prices. Its update notes document the currency merge, reroll choice and optional blocked substat. The three inventories below are original comparisons. None estimates hidden roll weights, live farming odds or event income.

Review dates describe this article and its references, not hands-on testing of a game account. Passages marked “Our advice” are GachaLoot’s recommendations. Check the current kit, challenge rules and upgrade preview for your own account.

[1] How many Self-Modeling Resin are required for Customized Synthesis?
HoYoverse Help Center — official support · Checked November 9, 2026
Exact two- and five-Resin totals for the selected main stat plus one or two selected substats.
[2] Before Their Deaths, Version 3.5
HoYoverse — indexed official update notes · Checked November 9, 2026
Wishful Resin merged into Self-Modeling Resin, including conversion of existing stock. No old exchange limit is used in the scenarios.
[3] Relic Synthesis: Stat Customization
Gachabase — released-client tutorial transcription · Checked November 9, 2026
The base Resin selects the main stat, and additional Resin selects one or two subsidiary stats.
[4] Paean of Era Nova, Version 3.0
HoYoverse — indexed official update notes · Checked November 9, 2026
Lv.15 reroll and the choice between original and rerolled results. Its original two-currency synthesis model was superseded.
[5] Variable Dice
Honkai: Star Rail Wiki — indexed item mechanics · Checked November 9, 2026
Eligible five-star Relics, unchanged substat identities, value and allocation changes, and the four-versus-five-upgrade distinction.
[6] Back to Earth in Evernight, Version 3.6
HoYoverse — official update notes reproduced on r/HonkaiStarRail · Checked November 9, 2026
Addition of the optional Interference Key and its one-stat exclusion during a reroll.
[7] Relic Stats
Honkai: Star Rail Wiki — indexed stat tables · Checked November 9, 2026
Slot and stat availability, fully enhanced ERR Rope value and the difference between starting lines and enhancement upgrades.
[8] Dance With the Beast Before Moonrise, Version 4.6
HoYoverse — official update notes · Checked November 9, 2026
Global version context for the November 9 review. The examples do not depend on the current farming events.

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View current Honkai: Star Rail codes