JBuild and Guide

Introduction

J is a 6✦ rarity character from the Beast afflatus who deals Reality damage and belongs to the Sub DPS class.

His kit focuses on Shields and counterattacks. Whenever allies with J’s shield are hit, J will counterattack all enemies and apply [Burn] to them and to himself. J’s [Burn] can also purify [Freeze] and [Cold], as well as greatly increase his damage and shield efficiency.When his HP is low, J’s capability to deal damage and resist negative statuses will be further improved.

To learn more about J check the sections below. Use the tabs to quickly switch to the kind of information you're looking for.

Last updated

J profile was last updated on August 8th, 2025.

To learn more about J check the sections below. Use the tabs to quickly switch to the kind of information you're looking for.

Profile

Review

Stats & Build

Synergy & Teams

Lore

Specialties

DPS

Shield

Riposte

Skills

Over the Haight Street!

Mass attack. Deals 350% Reality DMG to all enemies. Right before attacking, inflict [Burn] on the targets equal to the number of [Burn] stacks on self. J does not gain [Burn] stacks from this attack, and for every excess [Burn] stack on the main target, this attack deals an additional 10% Reality DMG.

"Ф This isn't an action film, and there are no heroes."

Hardness Testing

✦✧✧

[Debuff]

1-target attack. Deals 180% Reality DMG. Inflicts 2 stacks of [Burn] on the target hit; for every stack of [Burn] on self, grant all allies DMG Dealt +1% for 2 rounds.

"Ф A chance to test it in a real fight."

✦✦✧

[Debuff]

1-target attack. Deals 270% Reality DMG. Inflicts 2 stacks of [Burn] on the target hit; for every stack of [Burn] on self, grant all allies DMG Dealt +1% for 2 rounds.

"Ф A chance to test it in a real fight is hard to come by."

✦✦✦

[Debuff]

1-target attack. Deals 450% Reality DMG. Inflicts 2 stacks of [Burn] on the target hit; for every stack of [Burn] on self, grant all allies DMG Dealt +1% for 2 rounds.

"Ф A chance to test it in a real fight is hard to come by. So, who wants to go first?"

Burn:

Neg Status. Healing Taken -15% (unstackable). At the end of the round, takes (the holder's ATK x4%) Genesis DMG (stackable up to 30 times, multiple stacks of [Burn] is regarded as 1 [Neg Status], removes 50% of the stacks when triggered).

Heat Treating

✦✧✧

[Counter]

Mass counter. Grants all allies a [Shield] with (J's ATK x100%) HP for 2 rounds, with each stack of [Burn] on self granting an additional 3% Shield Factor. After an ally holding a Shield is attacked, J ripostes with [Tempering].

"Ф He was thrown into the fiery furnace of life."

✦✦✧

[Counter]

Mass counter. Grants all allies a [Shield] with (J's ATK x150%) HP for 2 rounds, with each stack of [Burn] on self granting an additional 3% Shield Factor. After an ally holding a Shield is attacked, J ripostes with [Tempering].

"Ф He was thrown into the fiery furnace of life at a young age."

✦✦✦

[Counter]

Mass counter. Grants all allies a [Shield] with (J's ATK x250%) HP for 2 rounds, with each stack of [Burn] on self granting an additional 3% Shield Factor. After an ally holding a Shield is attacked, J ripostes with [Tempering].

"Ф He was thrown into the fiery furnace of life at a young age, and to this day, he still feels little fear."

Tempering:

Mass attack. Deals 30% Reality DMG to all enemies. Inflicts 2 stacks of [Burn] on the targets hit. For every 10% Missing HP on self, deals an additional 10% Reality DMG.

Inheritance

Bodily Furnace

Insight I

When attacking, gain an ATK percentage equal to 0.5x of the number of [Burn] stacks on self, and resolve own [Burn] to deal damage to self while retaining the number of stacks. Every time after J's attack successfully inflicts [Burn], J grants the same number of [Burn] stacks to self. Take 50% less damage from resolving own [Burn] stacks, and never fall below 15% HP this way.

Materials

Sharpodontyx18000
Page of Beastly Thirstx6
Magnesia Crystalx6
Esoteric Bonesx5

Bodily Furnace

Insight II

DMG Dealt +8% when the caster enters battle.

Materials

Sharpodontyx40000
Scroll of Beastly Thirstx10
Fox Tailx5
Goose Neckx5

Bodily Furnace

Insight III

J's [Burn] stack limit is increased to 35, and becomes immune to [Freeze] and [Cold] while in the [Burn] status. At the start of the round, if J is below 50% HP, dispel all non-Burn [Stats Down] and [Neg Status] from self, then grant Critical Rate +20% to self for 1 round.

Materials

Sharpodontyx200000
Tome of Beastly Thirstx16
Platinum Ouijax5
Mistilteinnx3

Special effects

Burn:

Euphoria

J doesn't have an Euphoria update yet. If it will be released, we will add it here.

Portray

J Portray

Portray details

Lv. 1:

Heat Treating: [Tempering] now deals 40% Reality DMG. For every 10% Missing HP on self, now deals an additional 15% Reality DMG.

Lv. 2:

Bodily Furnace: Now gain an ATK percentage equal to 1.0x the number of [Burn] stacks on self.

Lv. 3:

Bodily Furnace: The [Burn] stack limit on self is increased to 45 stacks.

Lv. 4:

Over the Haight Street!: Reality DMG increased to 450%. For every excess [Burn] stack on the main target, this attack now deals an additional 15% Reality DMG.

Lv. 5:

Bodily Furnace: Now gain an ATK percentage equal to 1.5x the number of [Burn] stacks on self.

Gallery

Insight 0

Insight 2

Review

J is a 6-star Arcanist of the Beast Afflatus. Somewhere between Carry and Support, J's kit is focused around Counters and Burn, using both to deal consistent Mass DMG and apply sizable shields to the entire team.

From his passives, J inflicts [Burn] on himself whenever he applies it to an enemy, gaining an amount of ATK based on the amount of stacks on himself and taking reduced damage from [Burn]. In addition, while affected by [Burn], J is immune to [Freeze]/[Cold] and while below 50% HP, he dispels all non [Burn] statuses from himself to gain Crit Rate at the start of the round.

But how to apply [Burn]? That's done through “Heat Treating”. This Incantation applies a 2 turn shield to all allies, it's size scaling with the amount of Burn stacks on J. Whenever enemies attack allies that carry J's shields, he counters with "Tempering". This is a Mass attack that deals Reality DMG scaling with J's Lost HP and inflicts Burn on J.

Then there's “Hardness Testing”, which is a 1-target attack that inflicts [Burn] and grants allies a +DMG Dealt buff that scales with the amount of [Burn] stacks on J.

Finally, “Over The Haight Street” is a Mass attack that inflicts [Burn] on enemies equal to the amount of [Burn] on J before it lands, with every excess [Burn] stack increasing the damage dealt of this attack.

Gameplay Though he's not exactly punished for having [Burn], not reliably being able to be used with characters like 6 and Vila is a pretty steep price, as a majority of his kit revolves around either being low HP or having a lot of [Burn] applied to himself.

Beyond that, there's only good stuff here. All of his Counters (which he can trigger individually per ally, even on Mass attacks from enemies) count as Extra Attacks, allowing him to fuel FUA based teams. In addition, his extremely consistent [Burn] application provides solid support for [Burn] and [Neg Status] based teams, and his damage scaling with Lost HP allows him to slot into HP Loss comps with Semmelweis, Kakania and shielders. Him providing his own Crit Rate and +DMG Dealt buffs makes him remarkably self-sufficient, and his chunky 2-turn shields also help provide additional survivability, though his immunity to [Freeze] is kind of unremarkable.

In other words, he is a “niche” jack of all trades, focusing on dealing with aggressive enemies that cast a lot of incantations.

Pros & Cons

Pros

Potential for the highest FUA count per turn, granting him synergy with a wide variety of units such as 37, Flutterpage and Ms NewBabel (E1).
Very potent Mass [Burn] application for units like Isolde or debuff teams under Tuesday.
Powerful shields with a good duration once [Burn] is stacked.
J specifically does not have a Euphoria, however, paired with Ms NewBabel (E1), the two become a monstrous defensive + FUA support couple capable of sustaining a team without a healer and casting a ridiculous amount of Extra Actions.

Cons

Niche-oriented jack of all trades, revolves specifically around FUA, [Burn] or HP Loss, with only FUA being a well-represented niche in the current meta.
Wants P1 to start dealing good DMG.
Cannot function with some common Supports due to their Cleanse (6, Vila, Tooth Fairy).

Ratings

Overall

Resonance Builds

Build 1 - J – Crit Incantation

Level

R10 - Genuinity (Incantation Might/DMG Bonus)

Code

AkAAQgE5IDgiJjAoUSpQRAMvFC9EJlQkBPAk

Prioritizes Critical Rate and Critical DMG with some DMG Bonus and ATK. For those who want to build J as a crit DPS. His ripostes benefit from Incantation Might so Genuinity is a no-brainer. Note that this build does not have the highest attack; feel free to tweak the build to maximize his shield strength if that's what you desire.

If you don’t have Resonance Patterns unlocked, try this build with Placidity:

AEAAQgE5IDgiJjAoUSpQRAMvFC9EJlQkBPAk

Psychubes

The Unbearable Lightness

On the Hand of Time

Knock on the Door

Blasphemer of Night

Family Mentor2.8

Comments

The Unbearable Lightness is J's signature psychube and offers him valuable ATK scaling alongside some DMG bonus and Incantation Might.

On the Hand of Time grants him a lot of Critical DMG, which he can maintain with his many ripostes per turn.

Knock on the Door is a great alternative to his signature. J easily fulfills all the conditions for its passive, though he may have to fight Isolde for it.

Blasphemer of Night is pretty easy for him to activate since [Burn] is a [Neg Status].

Family Mentor is more of a supportive/sub-DPS option that increases all allies' Critical DMG by 12–24% at max stacks while also providing J with 12–24% Ultimate Might. The lack of offensive stats makes you lose out on a lot of his damage, though, so don't use this if J is your main DPS.

Stats

STAT

Base

Level 1

Level 30

Insight 1

Level 1

Level 40

Insight 2

Level 1

Level 50

Insight 3

Level 1

Level 60

ATK

241

367

404

614

651

916

950

1077

1449

2199

2425

3687

3913

5498

5704

6468

Reality DEF

129

196

215

329

348

490

508

577

Mental DEF

129

196

215

329

348

490

508

577

Critical Technique

368

417

466

515

Critical Rate

12.3%

13.9%

15.5%

17.2%

Critical DMG

148.4%

150.9%

153.3%

155.8%

Teams

The teams below come from our Teams database and showcase ANY team with J present within in all content available in the game.

Red Hot Chilipeppers

Niche 1: Debuff || Niche 2: -

Characters

About the team

A damage over time team based on Tuesday, whose Array allows [Poison] to stick and whose Insight lets her trigger [Poison] application when other allies inflict debuffs. This is very easy for Isolde and J, who both have a very steady application of [Burn], which adds to the DoT fantasy while Sotheby comes in as an overly powerful defensive anchor with additional [Poison] synergy herself.

Why Are You Hitting Yourself

Niche 1: HP Loss || Niche 2: FUA

Characters

About the team

Focused around getting J to as low as he can possibly go on HP values to maximize the DMG output of his "Tempering" counterattack. This is supported by Ms Newbabel(E), who easily doubles the size of his shields (to prevent the team from dying) while both Semmelweis and Eternity help lower J's HP while providing various buffs (Semmelweis through her Array and Eternity through her Euphoria) that scale with HP Lost.

Team 28

Shield - Core

Niche 1: Shield || Niche 2: Support Core

Characters

About the team

If you're looking for more team information, check our Team Database:

Team Database

Synergy

J Synergy information aren't available yet. They will be added soon!

Lore

J Lore information aren't available yet. They will be added soon!