Serapeum
Last updated 2026-08-12
Gacha AstralOp with capabilities focusing on Physical support. Has Special Skill to boost Astral Ring Intensity regen for Wheel of Destiny and World Star teams.
Serapeum is an unlockable AstralOp in Honkai Impact 3rd.
Understanding, acknowledgment, belonging, and love are what humans desire the most when they cry and scream in fear and loneliness.
Knowing this, a girl titled Union opened the library's doors to every visitor, connecting everyone with boundless and endless love.
One is all, and all is one. After the silent past settles once again, this innocent girl bearing everyone's wishes will finally understand that Union is also a kind of loneliness.
Unlock & Rank-Up
- Chips - manually unlockable when
Serapeum Origin Chip ×1 is obtained.
Time-limited
- Version 8.9: Iridescent Bazaar - obtainable after spending a total of
Crystals ×36,400 in Supply events (excluding Dorm and Returnee) while the event lasts. - Version 8.7: AstralOp Rotation - guaranteed after 60 pulls.
- 12:00, MAR 25 ~ 12:00, MAR 30
- Version 8.6: AstralOp Supply - guaranteed after 60 pulls.
- Version 8.5: AstralOp Rotation - guaranteed after 60 pulls.
- 12:00, NOV 7 ~ 12:00, NOV 14
- Version 8.2: AstralOp Supply - guaranteed after 60 pulls.
- Version 8.0: AstralOp Supply - guaranteed after 60 pulls.
- Version 7.8: AstralOp Supply - guaranteed after 60 pulls.
- Version 7.6: AstralOp Supply - guaranteed after 60 pulls.
Skills
Casts Synergy Attack and generates a book that pulls in nearby enemies and deals 1,500% ATK of Physical DMG to them. If Jovial Deception: Shadowdimmer is in Stellar Outburst state, Synergy Attack deals an additional 2,500% ATK of Physical DMG.
Unlocked by default.
1st Skill Row
Casts Synergy Attack and generates a book that pulls in nearby enemies and deals 1,500% ATK of Physical DMG to them. If Jovial Deception: Shadowdimmer is in Stellar Outburst state, Synergy Attack deals an additional 2,500% ATK of Physical DMG.
Unlocked by default.
Serapeum deals 100% more Physical DMG. Synergy Attack inflicts 3 Stun Trauma to enemies hit.
Unlocked by default.
[Team-triggered] Serapeum deals 33% more Total DMG and gains 16% Physical Breach for every team member with the Harmonized Shadow Star trait.
Unlocks at
While Wheel of Destiny is activated, increases Serapeum's ATK by 100% and Crit DMG by 150%, and Synergy Attack's Crit Rate by 100%.
Unlocks at
2nd Skill Row
In Astral Ring Charging state, landing an attack sends all team members into Intensity Recovery state for 1s, which restores 1 Astral Ring Intensity per 0.5s. Start a battle with 50 more Astral Ring Intensity, which applies once every 10 min in Part 2's Open World and shares a CD with other AstralOps. Enemies take 18% more Physical DMG and 12% more Elemental DMG in Stellar Outburst state.
Unlocked by default.
While Wheel of Destiny is active, Phantoms support attacks restore 14 Astral Ring Intensity; This can be triggered up to 2 times per Stellar Outburst state and up to 1 time per Stellar Surplus state. While World Star is active, the character restores 4.5 Astral Ring Intensity by casting Resonance ATKs; This can be triggered up to 5 times per Stellar Outburst state and up to 1 time per Stellar Surplus state.
Unlocked by default.
[Team-triggered] Increases initial Astral Ring Intensity by 8 for every team member with the Harmonized Shadow Star trait.
Unlocks at
While Wheel of Destiny is activated, characters on the field recover 1 SP per second in Rondo in the Shadows state.
Unlocks at
3rd Skill Row
All team members deal 18% more Crit DMG. With Wheel of Destiny activated:
● All team members deal 8% more Total DMG and Crit DMG.
● When entering battle or Stellar Outburst state, all team members gain Crit Conversation state. When the character attacks with less than 100% Crit Rate, converts 2.5% of Crit DMG to 1% Crit Rate until Crit Rate reaches 100% or 75% of Crit DMG has been converted.
● In Astral Ring Charging state, whenever Astral Ring Intensity becomes full, reduces the current Stellar Outburst's CD by 2.5s. This effect only triggers once per Astral Ring Charging state.
Unlocked by default.
Restores 1,600 HP when the on-field character's HP is below 50%. CD: 15s.
Unlocked by default.
[Team-triggered] Enemies take 5.5% more Elemental DMG and 2.5% more Physical DMG for every team member with the Harmonized Shadow Star trait.
Unlocks at
While Wheel of Destiny is activated, enemies on the field take 24% more Total DMG from Shadow Star Attack.
Unlocks at
※Any numbers shown are for MAX level skills.
Quotes
| AstralOp Menu | ||||
|---|---|---|---|---|
| ※ The following chats apply to all of the AstralOp's blue bubble lines and poke lines as well. | ||||
| Oh, sorry, I'm just curious what story you are telling internally. Could you tell me? | ||||
| Um, why do you know... I want to unify my mind with you? Can you also connect people? | ||||
| If everyone is me, could the person who you just talked to... also be me? | ||||
| In the end, that imperfect princess saved the hustle and bustle she cherished the most... Do you like this story? | ||||
| Miss Thelema thinks you're a special guest... Ah, I spelled out her thoughts again. | ||||
| For a while, "Lantern" often visited me to borrow books, because I told her books contain treasures. | ||||
| This book records many of your stories, but I prefer hearing them from you to reading them. Could you? | ||||
| As long as I'm here, you will never wander into the dark. We will always have each other, forever and ever. | ||||
| Don't be scared, come over here... I can comprehend your most outward emotions and understand all your thoughts. | ||||
| There's much love here... Would it bother them if I unified with them one by one? Oh, maybe I can through you... | ||||
| The Shu of Union and the owner of the library... But I want to be called a princess... Can I? | ||||
| ※ The following chats only unlock after completing certain Part 2 Main Story missions. | ||||
| Open World | ||||
- ※ Most Chinese and Japanese transcripts that aren't localized into English are simply based on the Chinese and Japanese audio respectively, so they may not be 100% accurate. 99.99% is most we can offer in best case scenarios.
Trivia
- In Version 8.0, Serapeum's Japanese voice actor was changed.
Speculations
As this content might be questioned by the community, information from this section shouldn't be quoted or referenced as if it was factual on other pages and, when referenced, it should be placed under a Speculations header there as well.
- The name of some of her passive skills are reminiscent of real life novels.
- Her second Synergy passive, [Silent Lamb], is a reference to the 1988 American horror novel The Silence of the Lambs.
- Her second Recharge passive, [A Heart for Lya], is a reference to the 1974 American science fiction novella, A Song for Lya.
- Her third Recharge passive, [The Baron in the Trees], is a reference to the 1957 Italian fiction novel, The Baron in the Trees.
- Her fourth Recharge passive, [The Name of the Rose], is a reference to the 1980s Italian historical mystery novel, The Name of the Rose.
