How to Beat Phantylia the Undying

Learn the best strategies and team compositions to overcome Phantylia the Undying, a challenging boss in Honkai: Star Rail. Master her mechanics and secure victory.

Stats / Weaknesses:

• Phantylia the Undying: Weak to Lightning, Wind, and Quantum.
• Summoned Allies (Stormbringer / Windspawns): Weak to Lightning, Ice, and Imaginary.

Phases:

1. Phase 1: Phantylia fights alone. She uses basic attacks and can apply Wind Shear. Focus on breaking her Toughness bar to interrupt her actions.
2. Phase 2: Phantylia summons two Stormbringers. These allies have their own Toughness bars and can deal significant damage. Prioritize defeating them quickly or controlling them with debuffs. Phantylia gains new abilities, including AoE attacks that hit multiple party members.
3. Phase 3: Phantylia summons two Windspawns. These are weaker than the Stormbringers but still pose a threat. Phantylia's attacks become more potent, and she can enter a empowered state. Continue to manage the adds and focus damage on Phantylia.

Strategy:

• Team Composition: A balanced team is recommended. Include a strong DPS (e.g., Seele, Jing Yuan, Kafka), a support character (e.g., Bronya, Tingyun, Pela), and a sustain character (e.g., Luocha, Bailu, Gepard). Consider a character that can exploit the weaknesses of the summoned allies.
• Weakness Break: Consistently breaking Phantylia's and her allies' Toughness bars is crucial to prevent them from unleashing devastating attacks.
• Target Priority: In Phase 2 and 3, focus on eliminating the summoned allies first, as they can overwhelm your team. However, if Phantylia is close to breaking, you may need to switch targets.
• Wind Shear Management: Phantylia's Wind Shear DoT can be punishing. Bring a healer or characters who can cleanse debuffs if your sustain is struggling.
• Ultimate Usage: Save your powerful Ultimates for when Phantylia is vulnerable or when you need to quickly clear summoned adds.
• Positioning: Ensure your healer and supports are protected from AoE attacks.