Honkai: Star Rail Luka Character Guide

Direct Punch - [Single Target]
Deals Physical DMG equal to 50%-110% of Luka's ATK to a single enemy.

Sky-Shattering Fist - [Single Target]
Consumes 2 stacks of Fighting Will. First, uses Direct Punch to deal 3 hits, with each hit dealing Physical DMG equal to 10%-22% of Luka's ATK to a single enemy target.
Then, uses Rising Uppercut to deal 1 hit, dealing Physical DMG equal to 40%-88% of Luka's ATK to the single enemy target.

[Single Target]
Deals Physical DMG equal to 60%-132% of Luka's ATK to a single enemy target. In addition, there is a 100% base chance to inflict Bleed on them, lasting for 3 turn(s).
While Bleeding, the enemy will take 24% of their Max HP as Physical DoT at the start of each turn. This DMG will not exceed more than 130%-371.8% of Luka's ATK.

[Single Target]
Receives 2 stack(s) of Fighting Will, with a 100% base chance to increase a single enemy target's DMG received by 12%-21.6% for 3 turn(s). Then, deals Physical DMG equal to 198%-356.4% of Luka's ATK to the target.

[Enhance]
After Luka uses his Basic ATK "Direct Punch" or Skill "Lacerating Fist," he receives 1 stack(s) of Fighting Will, up to 4 stacks. When he has 2 or more stacks of Fighting Will, his Basic ATK "Direct Punch" is enhanced to "Sky-Shatter Fist." After his Enhanced Basic ATK's "Rising Uppercut" hits a Bleeding enemy target, the Bleed status will immediately deal DMG for 1 time equal to 68%-88.4% of the original DMG to the target. At the start of battle, Luka will possess 1 stack of Fighting Will.

Immediately attacks the enemy. Upon entering battle, Luka deals Physical DMG equal to 50% of his ATK to a random single enemy with a 100% base chance to inflict his Skill's Bleed effect on the target. Then, Luka gains

1) In the Name of the World

Increases the wearer's DMG to debuffed enemies by 24~40%. When the wearer uses their Skill, the Effect Hit Rate for this attack increases by 18~30%, and ATK increases by 24~40%.
Notes: The first effect increases Luka's overall damage (if the enemy has a debuff). And although the second effect only increases his Skill's Effect Hit Rate and ATK, it's still a great 5-Star LC.

2) Incessant Rain

Increases the wearer's Effect Hit Rate by 24~40%. When the wearer deals DMG to an enemy that currently has 3 or more debuffs, increases the wearer's CRIT Rate by 12~20%. After the wearer uses their Basic ATK, Skill, or Ultimate, there is a 100% base chance to implant Aether Code on a random hit target that does not yet have it. Targets with Aether Code receive 12~20% increased DMG for 1 turn.
Notes: Although Luka doesn't really benefit from the Crit Rate bonus, the LC can help Luka stack his Effect Hit Rate so he can focus on other stats for Relics.

3) Good Night and Sleep Well

For every debuff the target enemy has, the DMG dealt by the wearer increases by 12~24%, stacking up to 3 time(s). This effect also applies to DoT.
Notes: Best at Superimposition 5 for Main DPS Luka as there is no support ability on this LC.

4) Solitary Healing

Increases the wearer's Break Effect by 20~40%. When the wearer uses their Ultimate, increases DoT dealt by the wearer by 24~48%, lasting for 2 turn(s). When a target enemy suffering from DoT imposed by the wearer is defeated, regenerates 4~6 Energy for the wearer.

5) Eyes of the Prey

Increases the wearer's Effect Hit Rate by 20~40% and increases DoT by 24~48%.
Notes: Another LC that helps Luka with his Effect Hit Rate while also increasing his Bleed damage.