Genshin Impact Illuga Build

Polearm

Geo Lightkeepers 23/12 Oriolus Domain of Mastery: Shadowed Legacy

Member of the investigation squad, the Nightmare Orioles. The youngest squad leader among the Lightkeepers.

Best Illuga Builds

BUFF SUPPORT Build

Weapons

Energy Recharge

Elemental Mastery

Elemental Mastery

Energy Recharge

Artifacts

Silken Moon's Serenade

Elemental Mastery +80 set

Substats Priority

1Energy Recharge

2Elemental Mastery

3CRIT Rate

Talents Priority

1QBurst

2ESkill

3NANormal Attack

Recommended Primary Stats

Sands

Elemental Mastery / Energy Recharge

Goblet

Elemental Mastery

Circlet

Elemental Mastery

Illuga is not affected by Lightkeeper's Oath.
Nightingale's Song initially has 21 stacks, and it can gain up to 15 additional stacks for every Geo Construct on the field when Nightingale's Song's Burst is used, or if Geo Constructs are created during the Burst, with 5 stacks gained per Geo Construct.
The Moondrifts created by the Lunar-Crystallize reaction are considered Geo Constructs.

Illuga is an OFF-FIELD BUFF SUPPORT character who buffs Geo DMG and Lunar-Crystallize DMG after using his Elemental Burst, which grants the Nightingale's Song effect. This buff scales on Illuga's Elemental Mastery, and with his A4 talent, is further amplified depending on how many Geo and Hydro characters are in the party. With his A1 talent, using either his Skill or Burst will grant other team members the Lightkeeper's Oath effect, which boosts the Crit Rate and DMG of Geo DMG, and if Ascendant Gleam is active, boost the character's Elemental Mastery as well.
Illuga's [C1] grants him 12 Energy if he triggers a Geo-related reaction while on-field, effectively changing his Burst cost from 60 to 48. This has a cooldown of 15 seconds.
Regarding Weapon Choices:

Dragon's Bane: An Energy Recharge sands may be necessary if you are unable to get enough ER from substats alone.

Regarding Artifacts:

Silken Moon's Serenade (4): This set requires [C2] Illuga.

Most Used Build from the Community

This build is based on the most used artifacts and weapons by the community. If you want to contribute to this data, you can do so by submitting your UID by clicking here.

Weapons

Favonius Lance

Energy Recharge

Dragon's Bane

Elemental Mastery

Artifacts

Silken Moon's Serenade

Night of the Sky's Unveiling

Wanderer's Troupe

Noblesse Oblige

Best Illuga Teams

View full Illuga teams guide

Illuga Skills

Oathkeeper's Spear

Dawnbearing Songbird

Summons the trusty messenger bird, "Aedon." Different effects are produced depending on whether the skill is Tapped or Held.

Tap
Aedon dashes towards enemies in front, dealing Geo DMG to enemies it comes into contact with.

Hold
Enter aiming mode, and command Aedon to dash towards opponents being aimed at, dealing Geo DMG to opponents it comes into contact with.

Shadowless Reflection

Light the lamp, dealing AoE Geo DMG, and gain Haunted Night's Oriole-Song effect for 20s. When this effect is active, Illuga gains 21 stacks of Nightingale's Song. When Normal Attacks, Charged Attacks, Plunging Attacks, Elemental Skills, and Elemental Bursts of nearby active party members deal Geo DMG to opponents, 1 stack of Nightingale's Song is consumed to increase the DMG dealt. Increase in DMG is based on Illuga's Elemental Mastery. If DMG is inflicted by Lunar-Crystallize, DMG dealt will increase further.
When Geo DMG dealt in this manner hits multiple opponents, multiple stacks of Nightingale's Song will be consumed, depending on how many opponents are hit.

Additionally, if there are Geo Constructs created by nearby party members on the battlefield while Illuga unleashes his Elemental Burst, or when nearby party members create Geo Constructs while Haunted Night's Oriole-Song is active, every Geo Construct on the battlefield will allow Illuga to gain 5 additional stacks of Nightingale's Song. Within 20s after unleashing his Elemental Burst, Illuga can gain a maximum of 15 additional stacks of Nightingale's Song this way.

When all stacks of Nightingale's Song have been consumed, or when the state's duration ends, the Haunted Night's Oriole-Song effect will end.

Passive Talent

Torchforger's Covenant

Ascension Phase 1

After unleashing Elemental Skill Dawnbearing Songbird or Elemental Burst Shadowless Reflection, other nearby party members will gain the Lightkeeper's Oath effect for 20s: For Geo DMG dealt to opponents, CRIT Rate increases by 5% and CRIT DMG increases by 10%.

Moonsign: Ascendant Gleam
Party members affected by the Lightkeeper's Oath effect have their Elemental Mastery increased by 50.

Demonhunter's Dusk

Ascension Phase 4

Nightingale's Song's effects are enhanced: When there are 1/2/3 Hydro or Geo characters in the party, Nightingale's Song will further increase DMG. Increase in DMG is equal to 7%/14%/24% of Illuga's Elemental Mastery. If this aforementioned DMG is inflicted by a Lunar-Crystallize reaction, increase in DMG is equal to 48%/96%/160% of Illuga's Elemental Mastery.

Moonsign Benediction: Unwithering in Winter

Passive

When Illuga is in the party, the party's Moonsign will increase by 1 level.

Night Warden's Stride

Passive

At night (18:00 – 06:00), your party members gain the Swift Stride effect: Movement SPD increased by 10%.
Does not take effect in Domains, Trounce Domains, or Spiral Abyss. Swift Stride does not stack.
Additionally, Illuga appears to be able to decipher the whispers of the Wild Hunt...

Constellations

Vigilant Sentinel

Constellation Lv. 1

After Illuga triggers a Geo-related Reaction on the field, he will regain 12 Elemental Energy. This effect can be triggered at most once every 15s.

Elk With Fanged Antlers

Constellation Lv. 2

When Elemental Burst Shadowless Reflection's Haunted Night's Oriole-Song effect is active, for every 7 stacks of Nightingale's Song consumed, Illuga will summon Aedon, dealing a single instance of Geo DMG to 1 nearby opponent. The DMG dealt is based on 400% of Illuga's Elemental Mastery and 200% of his DEF. This DMG is considered Elemental Burst DMG.

Earthshaking Maw

Constellation Lv. 3

Increases the Level of Elemental Burst Shadowless Reflection by 3.
Maximum upgrade level is 15.

Solarhunting Wolf

Constellation Lv. 4

When Elemental Burst Shadowless Reflection's Haunted Night's Oriole-Song effect is active, nearby active party members will have their DEF increased by 200.

Hurricane Steed

Constellation Lv. 5

Increases the Level of Elemental Skill Dawnbearing Songbird by 3.
Maximum upgrade level is 15.

Nightmare Orioles

Constellation Lv. 6

Enhances the Lightkeeper's Oath effect of the Ascension Talent Torchforger's Covenant: For Geo DMG dealt to opponents, CRIT Rate is increased by 10%, CRIT DMG is increased by 30%.

Moonsign: Ascendant Gleam:
When characters are affected by Lightkeeper's Oath, Elemental Mastery is increased by 80.
You must first unlock the Ascension Talent "Torchforger's Covenant."

Outfits

Steadfast Resolve

Default

Illuga's outfit is a custom-made uniform that was designed with his duties in mind. Though it is technically meant for work, Illuga has so many responsibilities that he rarely gets the chance to change his clothes, so in practice, this uniform might as well be considered his everyday wear.