How to Beat Phantylia in Honkai: Star Rail — A Complete 2026 Boss Guide

Phantylia, the Undying remains one of the most punishing encounters in Honkai: Star Rail, and even years after her introduction in Version 1.2, she continues to humble Trailblazers who walk into the Scalegorge Waterscape unprepared. Introduced as the headline antagonist of the A Dragon Gallant, Its Ocean Distant Trailblaze Mission, the Lord Ravager of the Antimatter Legion eventually settles into a permanent role as a weekly Echo of War challenge — the arena where players farm Regret of Infinite Ochema, the Ascension and Trace material required by Kafka, Blade, and Luka. With three distinct phases, two varieties of summoned Lotuses, and a debuff that quietly cripples healing, is it any wonder she is still considered the toughest Echo of War boss on the board?

Where to Find Phantylia and How to Unlock Her

Players cannot simply stroll into the fight. Phantylia must first be unlocked by progressing through the Version 1.2 Trailblaze Mission A Dragon Gallant, Its Ocean Distant, which naturally leads the crew to the Scalegorge Waterscape on the Xianzhou Luofu. The campaign battle against her plays out there, and once that story quest is complete, the arena reopens as a repeatable Echo of War encounter.

Phantylia's Weaknesses and Her Lotus Problem

The fight's real difficulty is not the boss's health pool — it is the additive chaos she creates. Phantylia herself is weak to Lightning, Wind, and Imaginary damage, and she resists Frozen (Ice) and Entanglement (Quantum) debuffs. Her summons, however, come in two flavours with different resistances:

Summon Type	Weaknesses	Key Behaviour
Abundance Lotus	Imaginary, Wind	Casts Samsara to drain 1 Skill Point; casts Mend to heal; grants 3 Skill Points to the player's team when destroyed (Moksha)
Destruction Lotus	Imaginary, Lightning, Quantum	Spawns with Weakness Protected; inflicts Black Prana's Snare (Prana-Siphon); revives from Repose after two turns

That Prana-Siphon debuff deserves special attention. It slashes the maximum restorable HP of an afflicted character by 30%, meaning even a perfectly timed heal can leave a teammate stranded at low health. Any team without a reliable cleanser is gambling with the run.

The Best Team Composition Against Phantylia

A resilient, weakness-matching roster is non-negotiable. The classic template still performs beautifully:

• Main DPS: Jing Yuan. His Lightning AoE, amplified by the Thunder Lord, shreds both the boss and her Lotuses simultaneously.

• Support: Tingyun, who buffs the main DPS and contributes Lightning damage of her own through her Talent.

• Second Support or Sub-DPS: Bronya for turn manipulation, Yukong for team-wide ATK buffs plus Imaginary damage, or Welt as a slow-applying hybrid damage dealer.

• Healer: Luocha is the gold standard — he cleanses Prana-Siphon, heals constantly, and chips in Imaginary damage. Natasha works as a budget cleanse option, while Bailu trades cleansing for raw survivability.

Why does Bailu still earn a mention despite lacking a cleanse? Because her Invigoration heals characters every time they take damage, effectively out-sustaining a reduced HP bar. Phantylia has no true party-wipe attack, so as long as Invigoration keeps ticking, the team survives. Her Talent's one-time revival is a welcome safety net too.

Modern rosters have widened the pool considerably. Any well-built Lightning, Wind, or Imaginary damage dealer can anchor the fight, provided the team still brings AoE coverage for the Lotuses and a dependable cleanser. The mechanics, not the character names, decide the outcome.

Phase 1: The Abundance Opening

Phantylia begins conservatively, leaning on Wind-based attacks that hit either a single target or the entire party. Her fourth move summons Abundance Lotuses, which behave like extra enemies on the field. Priority one is deleting them fast — they hand back three Skill Points when they die, and they are far squishier than their Destruction counterparts. Clear them, then pile damage onto the boss.

Phase 2: The Destruction Shift

Once her first HP bar empties, Phantylia transforms and swaps to Lightning-based Destruction powers. She now spawns Destruction Lotuses that inflict Prana-Siphon and enter Repose before reactivating two turns later. Imbibitor Lunae's Cloudhymn Roar support attack is invaluable here, softening the Lotuses so the team can keep its focus on Phantylia herself.

Phase 3: The Imaginary Endgame

The final phase is where the fight becomes genuinely overwhelming. Phantylia switches to Imaginary attacks and summons two Abundance and two Destruction Lotuses at once. Abundance Lotuses respawn when killed; Destruction Lotuses restore themselves after two turns. The strategy narrows to a simple but brutal loop: heal through everything, burst the boss, and pop Abundance Lotuses only when Skill Points run dry.

Final Tips for 2026 Players

• Level your team and Light Cones before attempting the fight — stats matter more than gimmicks here.

• Never ignore Prana-Siphon; cleanse it or heal around it.

• Save ultimate abilities for Phase 3 burst windows.

• Farm her weekly if you are building Kafka, Blade, or Luka — the Regret of Infinite Ochema does not drop anywhere else.

Is Phantylia unfair? Not quite. She is simply a fight that punishes greed and rewards preparation. Bring the right elements, bring a healer who understands debuffs, and the Lord Ravager falls like any other.