Bailu — Honkai Star Rail Character Guide

Bailu is a Lightning Abundance Sustain in Honkai: Star Rail, and this HSR build guide covers teams, relics, light cones, and investment priority. recommended relics are Warrior Goddess of Sun and Thunder with Giant Tree of Rapt Brooding; the top light cone is Night of Fright; the first investment target is LC S1; Bailu is strongest in Memory of Chaos (MoC T3).

Lightning Abundance Sustain · MoC T3 · PF T3 · AS T3

For account-specific results, use the HSR team builder, compare upgrades in Pull Advisor, optimize equipment in the Light Cone Advisor, or read the StarGuide methodology.

Overview

Reactive healing sustain whose Invigoration buff auto-heals allies after each hit, enabling survival against multi-hit barrages. Has a revive and 10% team-wide DMG reduction, but critically lacks cleanse and any offensive utility.

Reactive healing sustain on the Abundance path whose core loop revolves around applying Invigoration via Ultimate, then using Basic ATKs to stay SP-positive while Invigoration automatically heals allies after each hit they take. All healing scales off Bailu's Max HP. Has a one-time revive from her Talent and team-wide 10% DMG Reduction from A6, but critically lacks any cleanse or offensive utility.

Key Mechanics

Invigoration heals reactively after each hit, meaning it can save allies from multi-hit attacks that would otherwise kill them — if a boss deals 5000 damage across two hits and the ally has 4000 HP, the healing after the first hit allows survival. However, single massive hits exceeding current HP still kill before healing triggers.
No cleanse of any kind — cannot remove Freeze, Imprison, DoT, or any debuffs. This is Bailu's most critical weakness in late endgame where cleanse is often mandatory.
Provides zero offensive utility — no ATK buffs, no CRIT buffs, no Energy generation for allies, no Break support. Every limited sustain released since launch offers some form of team damage contribution that Bailu lacks entirely.
Skill bounce targeting is random — the 2 bounces after the initial heal can target any ally including the original target or allies at full HP, making it unreliable as emergency AoE healing.

Bailu Investment Priority

LC S1 — Night of Fright's Energy Regen boosts Ultimate uptime and Invigoration consistency. Its stacking ATK buff partially addresses her total lack of offensive utility.
E2 — E2's +15% Outgoing Healing after Ultimate meaningfully improves burst healing windows — the most impactful eidolon for pure sustain value.
E4 — Adds 10% DMG stacks per Skill heal (up to 30%), giving Bailu some offensive contribution she otherwise completely lacks. Useful if investing further.

Bailu Relics and Stat Targets

Recommended: Warrior Goddess of Sun and Thunder with Giant Tree of Rapt Brooding

Stat targets: SPD 134 / 143 / 160, HP 5600-6400+, Energy Regen 19.44%+

Main stats: Body: Healing Boost > HP% · Feet: SPD · Sphere: HP% · Rope: Energy Regen

Best Bailu Light Cones

Night of Fright (Best in Slot): Best option for Bailu. Energy Regen improves Ultimate cycling for consistent Invigoration uptime. Stackable ATK buff (up to 20% at S1 for 5 stacks) partially offsets her zero offensive utility. Unique heal-on-Energy-restore adds extra survivability between Bailu's turns. Technically Huohuo's signature but functions excellently here.
Time Waits for No One: Good pure-sustain option. HP% scaling amplifies all her heals directly, and Outgoing Healing% stacks multiplicatively. High base HP (1058) further boosts her HP-scaling heals. Lacks any team utility or Energy Regen — purely maximizes raw healing output with no other benefit.
Post-Op Conversation: Best accessible option. Energy Regen (up to 16% at S5) helps reach Ultimate faster for consistent Invigoration application. Outgoing Healing boost on Ultimate use synergizes naturally with her main healing cycle. Accessible from standard warp. Solid F2P floor.
Quid Pro Quo: Specialist option for teams with high Energy demands such as Blade or Jing Yuan. Restores up to 16 Energy at S5 to a random ally below 50% Energy each turn. Sacrifices all healing stats and output for team Energy support — only relevant when Energy generation is more valuable than raw healing.

Bailu FAQ

What relics should Bailu use?

Bailu's recommended relic setup is Warrior Goddess of Sun and Thunder with Giant Tree of Rapt Brooding, with stat targets around SPD 134 / 143 / 160, HP 5600-6400+, Energy Regen 19.44%+.

What is the best light cone for Bailu?

Night of Fright is the top listed light cone for Bailu. Best option for Bailu. Energy Regen improves Ultimate cycling for consistent Invigoration uptime. Stackable ATK buff (up to 20% at S1 for 5 stacks) partially offsets her zero offensive utility. Unique heal-on-Energy-restore adds extra survivability between Bailu's turns. Technically Huohuo's signature but functions excellently here.

How should I invest in Bailu?

Bailu's first listed investment priority is LC S1. Night of Fright's Energy Regen boosts Ultimate uptime and Invigoration consistency. Its stacking ATK buff partially addresses her total lack of offensive utility.

Important Notes

Lacks cleanse entirely — debuff-heavy enemies (freeze, imprison, DoT) cannot be countered. Devastating in late endgame where cleanse is often mandatory.
Provides no offensive utility. Every limited sustain released since launch offers Energy support, CRIT buffs, shields, or Break synergy — Bailu offers none of these.
Cannot prevent true one-shots. Revive triggers after death at low HP — if an ally is instantly killed by a single hit exceeding 100% of their Max HP, the revive triggers but cannot prevent the kill from processing.
Invigoration reactive healing can fail against massive single-hit attacks — healing triggers after damage is calculated, so a hit that exceeds current HP kills before healing activates.
Random Skill targeting (1 primary + 2 bounces) is unreliable as AoE emergency healing — bounces may heal full-HP allies repeatedly instead of the ally who needs it.