Luka is a 4-star Physical character on the Nihility Path, and he plays best as a Bleed applier who softens enemies for the rest of the team. His value comes from stacking damage-over-time, stripping a buff from his target with his Skill, and raising the damage an enemy takes through his Ultimate. To make all of that land consistently, the build prioritizes Effect Hit Rate and attack rather than crit.
Quick answer: Equip Good Night and Sleep Well, run four-piece Prisoner in Deep Confinement with two-piece Revelry by the Sea, and aim for 67% Effect Hit Rate, 2,600+ ATK, and 135+ SPD. Use ATK% body, SPD feet, Physical DMG sphere, and ATK% rope.
Best light cones for Luka
Luka wants a light cone that boosts his damage against debuffed enemies and helps his debuffs stick. Good Night and Sleep Well is the strongest pick because it grants a stacking damage bonus for each debuff on the target, which pairs directly with his Bleed and his Ultimate’s vulnerability effect. In the Name of the World is the standout 5-star option, since it raises his attack and Effect Hit Rate when he uses his Skill, making Bleed far more reliable to apply.
| Light cone | Rarity | Why it works |
|---|---|---|
| Good Night and Sleep Well | 5-star | Stacking damage for every debuff on the enemy |
| In the Name of the World | 5-star | Boosts damage to debuffed enemies, raises ATK and Effect Hit Rate on Skill |
| Those Many Springs | 5-star | Strong DoT-focused alternative |
| Eyes of the Prey | 4-star | Increases Effect Hit Rate and DoT damage |
| Fermata | 4-star | Supports DoT-heavy play |
| Void | 3-star | Adds Effect Hit Rate at battle start for early Bleed application |
Best relic sets and ornaments
Four-piece Prisoner in Deep Confinement is the top relic set. Because Luka raises the damage his target takes with his Ultimate, the set amplifies both his hits and his strong Bleed ticks. Four-piece Champion of Streetwise Boxing is the next best option, granting stacking attack as he attacks or gets hit, which feeds his ATK-scaling Bleed.
For Planar ornaments, Revelry by the Sea is the best choice thanks to its DoT bonus, and it needs at least 2,400 ATK to activate. Firmament Frontline: Glamoth is a strong alternative that increases attack and Bleed damage once you hit its SPD thresholds. Pan-Cosmic Commercial Enterprise also fits, since it raises Effect Hit Rate and converts that into extra attack.
| Piece | Recommendation |
|---|---|
| Relic set (best) | Prisoner in Deep Confinement (4-piece) |
| Relic set (alternative) | Champion of Streetwise Boxing (4-piece) |
| Ornament (best) | Revelry by the Sea |
| Ornament (alternative) | Firmament Frontline: Glamoth |
Main stats and substat priority
Skip crit entirely. Most of Luka’s damage comes from Bleed, which scales on ATK, so building crit is wasted budget. Lock in the main stats below, then funnel substats into Effect Hit Rate, SPD, and ATK%.
| Slot | Main stat |
|---|---|
| Body | Effect Hit Rate% / ATK% |
| Feet | SPD |
| Sphere | Physical DMG% |
| Link Rope | ATK% |
| Stat | Target |
|---|---|
| Effect Hit Rate | 67% (guarantees Bleed lands) |
| ATK | 2,600 or higher |
| SPD | 135+ (and faster than Kafka in DoT teams) |
The 67% Effect Hit Rate target is the number that keeps Bleed applying every time. SPD matters both for turn frequency and for activating ornament effects like Firmament Frontline: Glamoth, so prioritize it after your hit rate is secure.
Trace upgrade priority
Luka’s damage flows through his Bleed, so level his abilities in the order that strengthens it fastest. His Skill comes first because it applies the Bleed that does the bulk of his work. His Ultimate is next, since it grants Fighting Will, raises the target’s damage taken, and lands a heavy Physical hit.
- Skill (Lacerating Fist) — applies Bleed and is his core damage source.
- Ultimate (Coup de Grace) — adds Fighting Will, vulnerability, and burst damage.
- Basic ATK — enables the Enhanced Basic ATK, Sky-Shatter Fist.
- Talent (Flying Sparks) — builds Fighting Will faster for more enhanced attacks.
His ascension traces matter too. Kinetic Overload dispels one enemy buff when he uses his Skill, Cycle Braking regenerates 3 Energy per Fighting Will stack, and Crush Fighting Will gives each Direct Punch in his Enhanced Basic ATK a 50% chance to add an extra hit.
Best teams for Luka
Luka slots into DoT compositions as a support who stacks Bleed and raises enemy vulnerability. His strongest home is alongside Kafka, who detonates damage-over-time effects with her Skill and Ultimate.
| Team | Members |
|---|---|
| DoT (best) | Luka, Kafka, Ruan Mei, Huohuo |
| Free-to-play | Luka, Serval, Asta, Natasha |
| Mono Physical | Luka, Sushang, Silver Wolf, Natasha |
In the DoT team, Ruan Mei boosts Break Efficiency and delays enemy recovery, while Huohuo keeps everyone alive and topped up on Energy. For the mono Physical setup, Silver Wolf is the key piece because she can implant a Physical weakness on enemies that lack one. Sampo, Jiaoqiu, Robin, and Gallagher all work as flexible support or healer swaps depending on what you own.
Eidolons and their impact
Luka’s Eidolons reinforce his Bleed loop and his attack scaling. Most are quality-of-life and damage boosts rather than reworks, so he functions well at E0.
| Eidolon | Effect |
|---|---|
| E1 — Fighting Endlessly | +15% damage for 2 turns when acting on a Bleeding enemy |
| E2 — The Enemy is Weak, I am Strong | Skill hit on a Physical-weak enemy grants 1 Fighting Will |
| E3 — Born for the Ring | Skill +2 and Talent +2 (max Lv. 15) |
| E4 — Never Turning Back | +5% ATK per Fighting Will stack, up to 4 stacks |
| E5 | Ultimate +2 (max Lv. 15) and Basic ATK +1 (max Lv. 10) |
| E6 — A Champion’s Applause | Extra Bleed damage after Rising Uppercut hits a Bleeding target |
Build Luka as an attack-focused Bleed applier, secure that 67% Effect Hit Rate first, and pair him with a DoT carry like Kafka to get the most out of his vulnerability and damage-over-time. Once Bleed is landing every turn and his SPD clears 135, he turns into a dependable enabler that keeps enemies open for the rest of your team.
