Boothill team
Physical · BreakPlays Sustain · BreakA single-target Break carry: one Harmony unit raises Break damage, one implants the Weakness he needs, and the sustain is the one that also breaks.

Penacony
Build guide · Honkai: Star Rail
English voice: Erik Braa
The best Gallagher build in Honkai: Star Rail (Version 4.6) is Scent Alone Stays True with Warrior Goddess of Sun and Thunder. Updated November 5, 2026
Executing Gallagher's rotation faster will yield higher uptime of his Besotted state debuff on enemies fueling his main healing source his talent. Gaining as much Speed as possible is essential but after that Break Effect is Gallagher's only other way to scale his kit because of his bonus ability that converts it into Healing Output%. After gaining max Speed and as much Break Effect% as possible invest into defenses.
#1
Talent
Max first
#2
Skill
Then
#3
Basic
Next
#4
Ultimate
Later
Major traces, best first: Novel Concoction (A2) > Bottoms Up (A6) > Organic Yeast (A4)
When entering the battle, Gallagher regenerates 20 Energy and increases Effect RES by 50%.
When using the Skill, dispels 1 debuff(s) from the designated ally. At the same time, increases their Effect RES by 30% for 2 turn(s).
Extends the duration of the Besotted state inflicted by Gallagher's Ultimate by 1 turn(s).
Increases Gallagher's Break Effect by 20% and Weakness Break Efficiency by 20%.
A single-target Break carry: one Harmony unit raises Break damage, one implants the Weakness he needs, and the sustain is the one that also breaks.
Himeko follows up whenever an enemy is Broken, which turns the standard-warp Erudition unit into a Break team’s damage dealer at no pull cost.
Acheron charges her Ultimate off debuffs other characters apply, so the team runs two more Nihility units and a sustain that never needs a Skill Point.
A Break Effect carry with two Harmony units that raise Break damage and Weakness Break efficiency, and a sustain that keeps Break uptime rather than adding damage.
Feixiao converts ally attacks into her own follow-ups, so the other three slots are a follow-up partner, a Harmony unit that advances her, and a sustain.
Two Erudition units feed each other stacks on wide waves, a Harmony unit multiplies the area damage, and a sustain covers the turns spent charging.
Honkai: Star Rail 4★ Fire Abundance Support
Scent Alone Stays True tops the light cone ranking for Gallagher at S1, ahead of Quid Pro Quo, Post-Op Conversation and What Is Real?. That order is prydwen.gg's, measured in play and rephrased here; every row of it sits under Light cones below.
Run Warrior Goddess of Sun and Thunder on Gallagher, with Messenger Traversing Hackerspace and Iron Cavalry Against the Scourge behind it. The planar ornament is Forge of the Kalpagni Lantern. Main stats are Outgoing Healing body, Speed feet, HP% >= DEF% sphere, Energy Regen Rate rope. Roll substats in the order SPD (as much as possible) > Break Effect % (up to 150%) > Effect RES% > HP% = DEF%.
Trace priority is Talent > Skill > Basic > Ultimate. The Ultimate costs 110 energy, which is what an Energy Regeneration Rate target has to clear.
Gallagher plays Sustain · Break in the Boothill team, alongside Boothill, Ruan Mei and Fugue.