Mongil: Star Dive

Sera Guide

Last updated: July 9, 2026

Sera Guide collects build notes, tier position, skills, stats, teams, and related Mongil: Star Dive guides.

Sera

Path-walking Keymaker

4★ ICE Fighter Melee

Quick Read

Role: Main On-Field DPS
Damage: 8 / 10
Support: Somewhat decent Ice affliction from ult
Breaking: High
Field Time: Varaible Main Dps

Community Analysis

Sera's power derives from her access to Ophelia's sig. With it, she is a powerhouse of a main DPS unit, capable of outdpsing at minimum A2 Ophelia. With Narae, she keeps pace with Ophelia all the way up to A6 Ophelia.

Sera's kit may seem intimidating at first, but it comes down to two things:
1. Use skill or Ult to charge blue bar, which makes BA do big damage
2. Use BA to charge yellow bar, which makes skill do big damage

The most basic way to play Sera is to get a full bar of blue and mash BAs and Skills when they become available. There are ways to play Sera that better takes advantage of Ophelia's sig effect durations, but I'll leave that as an exercise to the reader. This playstyle would require CDR on monsterlings.

Overall, this character is an amazing alternative to medium investment Ophelia that is well worth building.

Note: Sera is quite weak without Ophelia's sig. You do kinda need it for her to compare with Cloud.

Tier Position

Low Investment

A6S

with Ophelia sig Expert

Low Investment

High Investment

A6S

with Ophelia sig Expert

Max Investment

A6S

with Ophelia sig Expert

Investment Scores

Ascension 6 / No Ophelia Signature6 / 10

Ascension 6 / With Ophelia Signature8 / 10

Playstyles and Builds

Playstyle

A6. Her A6 let's you do sooo many more skills

Skill Priority
Skill = BA >> Ult > Switch

Teammates

Main DPS core

Rotations

BA Mash > tap skill

At the start of the fight, have Sera do a full spin to charge Lacrima. For the remainder of the fight, her Ultimates will charge Lacrima and you never have to spin again.

Profile

Sera is a magical keymaker who has mysteriously lost her ability to unlock doors, on a quest to uncover the truth behind her parents' disappearance. Despite having mastered the art of unlocking magical barriers, she still struggles to unlock the hearts of others.

#Arrogant#HidingSomething#Competitive#LuxuryLover

Birthday: August 8th
Height / Weight: 160cm / 51kg
Hometown: Epitar
Likes: Limited edition luxury goods, Winning fights
Dislikes: Losing, People who don't take care of themselves

Basic Information

Name: Sera
Element: ICE
Role: Fighter
Attack Range: Melee
Rarity: 4★ (SR)

Stats

Grade Lv.1

HP756

ATK96

DEF32

Groggy DMG14

Brawler55

Signature Artifact

Key for Locks Yet to Come

Skills

Lv.1

Arkarion: BoundNormal_ATK

Sera deals Physical DMG by swinging Arkarion and gains Laxima Energy.

1st Hit DMG: 26.6%2nd Hit DMG: 26.6%3rd Hit DMG: 16.6%4th Hit DMG: 69.1%Charge Attack DMG: 23.8%Air Counter DMG: 61.8%Evasion Counter DMG: 127.6%

Upgrade Requirements

Total Requirements (Lv.1 to 16)

78.500

Laxima: SealedActive01

Sera spins with Laxima in hand, dealing Ice DMG and gaining Arkarion Energy.

While spinning, enemies within range are pulled towards her. Upon releasing the Special Skill button, she raises Laxima to render enemies Airborne. (Total DMG remains the same regardless of when the button is released.)

If enemies are too far, she approaches them quickly before spinning. Sera can move slowly while spinning.

DMG: 279.6%Cooldown: 14.9s

Upgrade Requirements

Total Requirements (Lv.1 to 16)

78.500

Arkarion Laxima: UnleashedUltimate

Sera unleashes Laxima's hidden power into Arkarion, dealing Ice DMG and inflicting Ice Affliction and Freeze.

After unleashing, Sera enters the Arkarion Unleashed state.

Laxima Unleashed DMG: 262.8%Cooldown: 3.0s

Upgrade Requirements

Total Requirements (Lv.1 to 16)

78.500

Arkarion: RestrictedSkill_Tag

Sera deals Physical DMG by quickly approaching the enemy and swinging Arkarion, gaining Laxima Energy.

DMG: 84.3%

Upgrade Requirements

Total Requirements (Lv.1 to 16)

78.500

Lock ShardPassive

Using a Basic Attack or Switch Skill while controlling Sera consumes Arkarion Energy, dealing Ice DMG and triggering an additional strike. Sera's Crit DMG increases for a set duration upon attacking enemies afflicted with Ice Affliction.

Using a Special Skill in the Laxima Unleashed state completely consumes Sera's Laxima Energy to increase her Special Skill DMG.

Laxima Unleashed
Once Sera's Laxima Gauge is fully charged with Laxima Energy, she enters the Laxima Unleashed state.

Arkarion Unleashed
Once Sera's Arkarion Gauge is fully charged with Arkarion Energy, she enters the Arkarion Unleashed state.

Ascensions

+1Lv.20 to 30

30.000

120Basic Fighter Medallion

+2Lv.30 to 40

60.000

8Standard Fighter Medallion

+3Lv.40 to 50

120.000

6Greater Fighter Medallion

+4Lv.50 to 60

250.000

4Superior Fighter Medallion

Canto

Secret Time

Sera gains Laxima Energy 2 times faster upon using her Basic Attacks or Switch Skill.

Holding the Basic Attack button when she has Arkarion Energy quickly moves her to the enemy and triggers Arkarion: Focused Spin.

Arkarion: Focused Spin
This attack deals Ice DMG equal to 150% of Sera's Basic Attack's 4th Hit and consumes up to 31.25% of her Arkarion Energy. However, Sera cannot gain Laxima Energy, and enters the Unstable Arkarion state for 5s after using this skill, making Arkarion: Focused Spin unavailable.

Requirement

1Seed of Destiny - Sera

Key Maker

The max Arkarion Gauge charge increases by 62.5%.

Sera's Special Skill's spin duration increases, increasing total DMG by 50%. Her Movement Speed while spinning increases by 60%, and the amount of obtainable Arkarion Energy increases by 62.5%.

Requirement

1Seed of Destiny - Sera

Insatiable Curiosity

The skill levels of the Basic Attack, Switch Skill, Special Skill, and Ultimate Skill increase by 2.

Special Skill's cooldown decreases by 4.5%.

Requirement

1Seed of Destiny - Sera

Open the Magic Path

Arkarion Unleashed lasts for 10s upon using Sera's Ultimate Skill.

While in the Arkarion Unleashed state, the next Basic Attack or Switch Skill DMG have a 30% chance of inflicting Ice Affliction on the enemy.

Requirement

1Seed of Destiny - Sera

Unleashed

The skill levels of the Basic Attack, Switch Skill, Special Skill, and Ultimate Skill increase by 2.

Increases Basic Attack DMG by 6%.

Requirement

1Seed of Destiny - Sera

Unlock the Light

When Sera enters the Laxima Unleashed state, her Special Skill cooldown is reset.

While in the Arkarion Unleashed state, the Crit DMG of her next Basic Attack or Switch Skill increases by 30%.

Requirement

1Seed of Destiny - Sera

Story

The Only Child

Sera was born in Epitar, the thriving capital of Herma, as the only child of the Vanderbilts, one of the city's most powerful and influential couples.

Her parents, Cyrus and Aurora, were genius magi and pioneers of magical automations. Their groundbreaking inventions and production of magical devices revolutionized productivity across magus society, and they amassed incredible wealth and prestige. They struggled to conceive until a later age when they finally had Sera, and they hoped she would grow into a worthy successor.

However, Sera had no interest in fulfilling the expectations of others. In an effort to discipline her, her father enrolled her into Deldoer Magic Academy, a school infamous for its rigid rules and curriculum.

At first, Sera behaved cautiously, just like her father had hoped. But before long, she began to dominate the student body and the faculty with her wealth and power.

The Magic Academy's Keymaker

Highly competitive and proud, Sera often found herself seething with jealousy whenever fellow students were praised for their magical talent.

That envy drove her to focus on her studies, and one specific branch of magic held special interest to her. Sera was able to use her family's wealth to control anything, even her friends, but there was one thing money couldn't buy. The key to her father's storage vault.

Sera began studying everything related to magical seals, and as time passed, her power grew. By her fifth year, she was able to solve most seals with a single touch. She also invented unique unlocking spells only she could wield.

This earned her the nickname "The Keymaker" among her peers. Finally, she was able to unlock even her father's vault. Her parents were very pleased by her progress, but that wasn't enough to satisfy Sera.

Her eyes had already turned to something far more dangerous, the legendary lock, Laxima, and its counterpart, Arkarion. No one had ever laid claim to them, and Sera believed that she was destined to be their true master.

A Critical Price

In Elbraha Plateau, the heart of the continent, Sera discovered the "World's Navel." There, sealed away by their ancient creators, were two legendary artifacts: the cursed lock, Laxima, and its key, Arkarion.

Sera descended down the sealed staircase using a special magical device stolen from her father's vault and finally set her hands on the legendary key.

However, Laxima was not an ordinary magical lock. As Sera removed the key Laxima warned, "Power demands a price." Sera would pay with what she held most dear. But Sera wasn't too concerned; she assumed she would lose some jewels or a magical device.

Upon unlocking Laxima's seal and returning home, she was shocked to hear that her parents had gone missing. Laxima's curse had truly taken what she held most dear: her family.

Beginning the Journey

Determined to find her parents, Sera spared no expense. She hired multiple magi to study Laxima's curse.

After extensive research, she concluded that her parents were not dead, but likely trapped within a space known only as the "Still Room." A timeless void where nothing could die.

However, those who opened this room would have to pay a price. They would lose all their memories of Arkarion and all that they'd attained with it.

Without hesitation, Sera decided to embark on a journey to find her parents. She packed Laxima in her designer bag and began her journey across unknown dimensions.

To use Laxima's power, she had to fulfill various "promises," but Sera pressed on, driven by the singular vow: to bring her parents home.

The Path of No Return

Searching for traces of her parents, Sera journeyed through countless doors across Belana and arrived in Solismenamus.

Months later, after having fulfilled all of Laxima's demands but still unable to find her parents, Sera decided to return home. She tried to summon the power of Arkarion, but for some reason, a door wouldn't open.

After trying several times, she was shocked to realize that she could no longer open doors. She didn't know why the key no longer responded. Now, in order to find her parents, she had to find a way to restore the key's power.

She suspected that the Void, which had begun to taint this world, had affected the key's powers, and contacted Monster Tamers to find a group of adventurers rumored to be pursuing the Void phenomenon.

Sera Guide

Sera

Quick Read

Community Analysis

Tier Position

Investment Scores

Playstyles and Builds

Playstyle

Rotations

Profile

Basic Information

Stats

Signature Artifact

Skills

Total Requirements (Lv.1 to 16)

Total Requirements (Lv.1 to 16)

Total Requirements (Lv.1 to 16)

Total Requirements (Lv.1 to 16)

Ascensions

Canto

Story

Also featured in

Hypercarry Teambuilding Guide

Team Composition Guide

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