Effect Hit Rate vs Effect RES in Honkai: Star Rail: the difference and how much you need
30-second answer: Effect Hit Rate (EHR) is a stat on YOUR side that raises the chance your debuffs (DEF shred, DoT, freeze...) land on enemies. Effect RES does the opposite, lowering the chance enemy debuffs land on you. Landing chance = Base Chance × (1 + EHR) × (1 − enemy Effect RES). Against a standard enemy with 40% Effect RES, a debuff with 100% base chance only needs about 67% EHR to be guaranteed. Some DoT units gain damage from EHR breakpoints, so they may want 75% or 120%. A pure DPS with no debuffs needs no EHR.
What is Effect Hit Rate
Effect Hit Rate (EHR, 効果命中 in Japanese) is a stat on YOUR characters. It sets the chance you land a debuff on an enemy. A debuff is any negative status: DEF reduction, Burn, Bleed, Freeze, stun, or the stacking marks that DoT teams pile on. The higher your EHR, the more reliably those effects stick. Picture spraying glue on a wall: EHR is how sticky the glue is. Stickier glue means the paper (your debuff) holds on. That is why DEF-shredders and DoT (damage-over-time) units care about this stat. Important: some skills read 'fixed chance' and are NOT affected by EHR at all. EHR only scales skills that read 'base chance'. To check whether a unit needs EHR, open the Character page on GameVika and read the skill text; wherever it says 'base chance', that ability benefits from EHR.
What is Effect RES
Effect RES (効果抵抗) does the OPPOSITE of EHR. It lowers the chance a debuff lands on whoever carries it. Same glue analogy: Effect RES is a film of oil on the wall that makes the glue slide off so the paper cannot stick. This stat has two sides. The enemy side: elite or high-level foes (Lv80 to 90) in endgame content usually carry around 40% innate Effect RES, which is exactly why a '100% base chance' skill can still whiff, and why you stack EHR to compensate. By contrast, many trash mobs have 0% Effect RES, so a 100% base-chance debuff always lands; the 40% figure is only an ASSUMPTION used to plan for high-level enemies, not something every mob has. The enemies' own debuff-landing rate against your team is roughly 30%. The player side: you can build Effect RES on a character to resist being stunned, frozen, or hit by DoTs. As a rough table: every 10% Effect RES shaves off about a tenth of the landing rate, so around 30% Effect RES pulls that ~30% enemy hit rate down to about 21%, 40% takes it to about 18%, and 50% to about 15% — meaning roughly 30% Effect RES already neutralises most enemy debuffs. The 30% mark is also a natural target because a Relic set unlocks a bonus the moment you hit exactly 30%. It is a soft defensive stat, never mandatory, and usually only worth it in specific stages where enemies rely on crowd control. Most of the time you prioritise offensive stats over Effect RES.
| Your Effect RES | Enemy still lands (~30% base) |
|---|---|
| 30% RES | ~21% |
| 40% RES | ~18% |
| 50% RES | ~15% |
The one formula that runs it all
Both stats meet in a single invariant formula, cross-checked across sources: Hit Chance = Base Chance × (1 + EHR ÷ 100) × (1 − enemy Effect RES ÷ 100). Read the three parts slowly. Part one is the base chance printed on the skill, say 100% or 80%. Part two is your EHR bonus; 50% EHR means multiplying by 1.5. Part three is the enemy resisting; 40% RES means multiplying by 0.6. Try real numbers: a 100% base-chance skill, you carry 67% EHR, versus an enemy with 40% RES. That is 100% × 1.67 × 0.6 = 100%. Guaranteed land. This is exactly why 67% keeps coming up as the baseline for any debuffer. One common mistake: EHR and RES do NOT add or subtract directly, they MULTIPLY. Because it is multiplication, each extra point of EHR is worth less the higher you go. Once you hit your target, stop and pour the rest into offense.
Your Effect Hit Rate50% EHR = ×1.5 Enemy's Effect RES40% RES = ×0.6 How much EHR is enough
Here is a practical breakpoint table, computed against a standard 40% Effect RES enemy. Left column is the skill's base chance, right column is the EHR needed for a guaranteed land: 120% base needs 39% EHR; 100% base needs 67%; 90% needs 86%; 80% needs 109%; 70% needs 139%; 60% needs 178%. The pattern is clear: low-base-chance skills demand a lot of EHR, sometimes more than it is worth. So what do you actually aim for? For a DEF-shredder or crowd-controller with a 100% base-chance skill, about 67% EHR is plenty. For DoT units, do not stop at 67%: many of them have traces that grant bonus damage at EHR thresholds (such as 75%, or 120% to cap the buff), so build up to the exact number their trace lists. To see precisely how each point plays out, feed your stats into GameVika's Damage tool and check land-versus-whiff before you spend materials leveling Relics.
| Skill's base chance | EHR needed for 100% (enemy 40% RES) |
|---|---|
| 120% | 39% |
| 100% | 67% |
| 90% | 86% |
| 80% | 109% |
| 70% | 139% |
| 60% | 178% |
How to build EHR and Effect RES
EHR comes from three main places. One, substats on Relics, which grind up slowly. Two, the main stat on the Link Rope (one of the six Relic slots can roll EHR as its main stat). Three, Light Cones and a few Relic sets that grant flat EHR through their passive. The efficient path is usually one EHR main-stat rope plus a few substat lines to hit your target, rather than forcing every slot to roll EHR. For Effect RES, there are also Light Cones that grant it directly, and a two-piece Relic set that gives 10% Effect RES with a bonus: once Effect RES reaches 30% or more, the whole team gains CRIT DMG, turning a defensive stat into team-wide offense. Do not build blind. Before dumping Relics into a unit, run GameVika's Relic Score tool to see which pieces are worth keeping, and open the Character page to read the trace for the exact EHR target. Reach the breakpoint, then send every surplus roll into ATK, CRIT Rate, and CRIT DMG.
FAQ
If a skill says 100% base chance, does it always land?
No. That 100% is the base chance, before the enemy's Effect RES is applied. High-level enemies usually carry around 40% Effect RES, so your real land chance drops below 100% with no EHR. To pull it back to a guaranteed 100%, you need about 67% EHR against a 40% RES enemy.
Does a pure DPS that only deals direct damage need EHR?
No, unless their kit applies a debuff via base chance. If the character only hits for raw damage with no DEF shred, DoT, or crowd control, every point of EHR is wasted. Send it all into ATK, CRIT Rate, and CRIT DMG. Read the skill text on the Character page to see whether 'base chance' appears anywhere.
Do EHR and Effect RES just add and subtract directly?
No, they multiply rather than add or subtract directly. The formula is Base Chance × (1 + EHR) × (1 − RES). Because it is multiplication, each extra point of EHR gives diminishing returns. Hit your required breakpoint and stop; do not keep stacking EHR once you already land at a guaranteed 100%.
Should I build Effect RES on my whole team?
Usually not. Effect RES is only worth building in specific stages where enemies frequently stun, freeze, or apply DoTs to your team. As a guide, around 30% Effect RES pulls the enemies' ~30% landing rate down to about 21%, blocking most debuffs, and 50% takes it to about 15%. At exactly 30% there is also a two-piece Relic set granting 10% Effect RES that unlocks team CRIT DMG, making the stat both defensive and offensive. Outside that case, prioritising offensive stats is still better.
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