Gallagher Build Guide for Honkai Star Rail

Updated 6 November 2026 · Standard formula, shown below

This guide explains how to build Gallagher in Honkai: Star Rail, covering his best light cones, relics, planar sets, stats, and team roles so you can maximize his healing and debuff support. Gallagher is a 4-star Fire-type character on the Path of Abundance who heals allies and applies the Besotted debuff, which increases Break damage taken by enemies and heals attackers.

Who Is Gallagher and What Does He Do?

Gallagher is a 4-star Fire Abundance character introduced in Version 2.1. He is a healer who scales with Break Effect, making him unique among Abundance characters. His kit revolves around applying Besotted to enemies, which makes them take increased Break damage and causes any ally who attacks a Besotted enemy to restore HP based on Gallagher’s Break Effect. His Ultimate deals Fire damage to all enemies, applies Besotted to them, and advances his own action. His Talent increases his Break Effect and grants him a self-heal when his HP drops below a threshold.

Because his healing scales with Break Effect, building him is different from building other healers. You want to focus on Break Effect, Speed, and HP rather than pure Outgoing Healing. He also has a strong niche in Break teams, especially with characters like Firefly or Harmony Trailblazer, but he works as a general sustain unit in many teams.

How Gallagher’s Kit Works

To build Gallagher effectively, you need to understand his core mechanics:

Besotted debuff: Enemies with Besotted take increased Break damage. When an ally attacks a Besotted enemy, the attacker restores HP equal to a percentage of Gallagher’s Break Effect (plus a base amount). This heal triggers once per ally per attack.
Ultimate: Deals Fire damage to all enemies, applies Besotted to them, and advances Gallagher’s action forward by 100%. This lets him act again immediately, often to use his Skill or Basic ATK.
Skill: Deals Fire damage to a single enemy and heals one ally for a percentage of Gallagher’s Max HP plus a flat amount. The heal is not tied to Break Effect, but his Talent boosts his Break Effect, which indirectly increases the Besotted heal.
Talent: Increases his Break Effect by a percentage (up to a cap) and grants him a self-heal when his HP drops below 50% (once per turn).
Technique: Deals Fire damage to all enemies and applies Besotted to them at the start of battle.

His healing output is a mix of direct heals (Skill, Ultimate’s Besotted heal) and reactive heals (Talent). Because the Besotted heal scales with Break Effect, you want to stack as much Break Effect as possible without sacrificing too much Speed or HP.

Best Light Cones for Gallagher

Gallagher’s best light cone is his signature, Echoes of the Coffin (5-star, Abundance), which increases Break Effect and regenerates energy when an ally attacks a Besotted enemy. However, since it’s a limited 5-star, most players will use 4-star options. Here are the top choices:

Echoes of the Coffin (5-star): Increases Break Effect by 60% (at S1) and regenerates 5 energy when an ally attacks a Besotted enemy. This is his best-in-slot for both healing and energy.
Shared Feeling (4-star): Increases Outgoing Healing by 10% and regenerates 2 energy for the team when the wearer uses their Skill. This is a solid generalist option, but it doesn’t boost Break Effect.
Post-Op Conversation (4-star): Increases Energy Regeneration Rate and increases Outgoing Healing when the wearer uses their Ultimate. This helps with Ultimate uptime, which is key for applying Besotted.
What Is Real? (4-star, free from Battle Pass): Increases Break Effect by 28% and restores HP when the wearer uses their Ultimate. This is a great free option that directly boosts his main stat.
Multiplication (3-star): Increases Basic ATK DMG and regenerates energy when the wearer uses Basic ATK. This can be used for SP generation, but it’s not recommended for healing.

If you have no 5-star or 4-star options, use any Abundance light cone that provides Energy Regeneration or Outgoing Healing. The key is to get his Ultimate off as often as possible.

Best Relics and Planar Sets

Gallagher’s relic sets should prioritize Break Effect and Speed. The best main set is Watchmaker, Master of Dream Machinations (4-piece), which increases Break Effect by 16% and, when the wearer uses their Ultimate, increases all allies’ Break Effect by 30% for 2 turns. This synergizes perfectly with his Ultimate and helps the whole team in Break compositions.

If you don’t have a full Watchmaker set, you can mix 2-piece Watchmaker with 2-piece Messenger Traversing Hackerspace (Speed +6%) or 2-piece Passerby of Wandering Cloud (Outgoing Healing +10%). The latter is a budget option but loses the Break Effect.

For planar sets, the best is Firmament Frontline: Glamoth, which increases ATK by 12% and increases DMG dealt by 12% if the wearer’s Speed is 135 or higher. However, Gallagher doesn’t need ATK, so the more common choice is Space Sealing Station, which increases ATK and increases ATK further with Speed. Since neither directly boosts Break Effect, many players prefer Talia: Kingdom of Banditry, which increases Break Effect by 16% and increases it by an additional 16% if the wearer’s Speed is 145 or higher. This is his best planar set for Break Effect.

Main stats to aim for:

Body: HP% or Outgoing Healing (HP% is better if you need survivability, but Outgoing Healing boosts his direct heals)
Boots: Speed (to reach 145 for Talia bonus, or just for more turns)
Planar Sphere: HP% (or Fire DMG% if you want more damage, but HP is safer)
Link Rope: Energy Regeneration Rate (to get Ultimate faster) or Break Effect (if you have enough energy from other sources)

Substats to prioritize: Break Effect, Speed, HP%, and Effect RES (to avoid being debuffed). Aim for at least 145 Speed to activate Talia’s full bonus, and as much Break Effect as possible (200%+ is a good goal).

Team Compositions and Synergies

Gallagher shines in Break teams, but he can also serve as a solo sustain in many teams. Here are some common team archetypes:

Break Team: Pair him with Firefly or Harmony Trailblazer, who also scale with Break Effect. His Besotted debuff increases Break damage, and his heals keep the team alive. The Watchmaker set’s team-wide Break Effect buff further amplifies this.
Hypercarry Team: Use him as the sustain for a DPS like Jingliu or Imbibitor Lunae. He provides healing and can generate Skill Points with Basic ATK, but his debuff is less impactful outside Break teams.
Dual Sustain: In content with heavy damage, you can pair him with another healer or shielder, but his healing is usually sufficient if built properly.

His best teammates are those that benefit from Break Effect or can apply debuffs. He also works well with characters that have high attack frequency, as each attack on a Besotted enemy triggers a heal.

Common Mistakes and Misconceptions

One common mistake is building Gallagher like a traditional healer with Outgoing Healing and HP, ignoring Break Effect. This reduces his Besotted heal significantly, making him a mediocre healer. Another mistake is neglecting Speed, which is crucial for both his personal turns and Talia’s planar set bonus.

Another misconception is that Gallagher is a main DPS. While he can deal decent Fire damage, his role is support. Don’t prioritize ATK or Crit stats; focus on Break Effect and Speed.

Also, note that his Besotted heal triggers only when an ally attacks a Besotted enemy, not when he attacks. So you want your DPS to focus Besotted targets to maximize healing. In multi-target fights, prioritize applying Besotted to the enemy your team is focusing.

Frequently Asked Questions

What is Gallagher’s best light cone?

His signature light cone, Echoes of the Coffin, is his best, but for free-to-play players, the Battle Pass light cone What Is Real? is an excellent choice. Shared Feeling and Post-Op Conversation are also good 4-star alternatives if you need energy or healing.

How much Break Effect should Gallagher have?

Aim for at least 200% Break Effect, but more is better. With the Watchmaker set and Talia planar set, you can reach 250% or more with good substats. This significantly increases his Besotted heal and Break damage.

Should I use HP% or Outgoing Healing on his body piece?

HP% is generally better for survivability, but Outgoing Healing increases his direct heals (Skill and Ultimate’s Besotted heal). If you have enough HP from substats, Outgoing Healing is fine. Otherwise, HP% is safer.

Is Gallagher good in non-Break teams?

Yes, he can work as a general healer, but his kit is less impactful without Break synergy. His healing is still decent, but other healers like Luocha or Huohuo may be more consistent. Use him in Break teams for maximum value.

What is the best planar set for Gallagher?

Talia: Kingdom of Banditry is his best planar set because it provides Break Effect and a conditional bonus at 145 Speed. Space Sealing Station is a budget option if you don’t have Talia, but it offers less Break Effect.

Does Gallagher need Energy Regeneration Rope?

Yes, if you want his Ultimate up frequently, which is essential for applying Besotted. With Energy Regeneration, you can use his Ultimate every 3 turns or so. If you have his signature light cone, you might not need it, but it’s still recommended for consistency.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.