RegulusBuild and Guide

Introduction

Regulus is a 6✦ rarity character from the Star afflatus who deals Mental damage and belongs to the Support class.

Regulus is a powerful Crit Carry who can double as a defensive support. Her passive allows her to AFK every other turn and gain extra Crit Rate for free (the excess of which will overflow into her Crit DMG). Her Ultimate and Moxie manipulation also make her provide a lot of defensive support, making her incredibly strong and versatile in Crit teams.

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

Last updated

Regulus profile was last updated on August 7th, 2025.

To learn more about Regulus 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

Support

Skills

Sleepless Rave

Mass attack. Deals 300% Mental DMG to all enemies and inflicts [Riot and Roll] status on all allies for 1 round.

"Ф Let the starlight and musical notes party tonight, I am their king!"

Riot and Roll:

Dodges any non-Ultimate attacks. Dispels the effect after the caster takes action.

Treat for the Ears

✦✧✧

[Attack]

1-target attack. Deals 200% Mental DMG.

"Ф They tried hard to guess the deeper meaning behind it."

✦✦✧

[Attack]

1-target attack. Deals 300% Mental DMG.

"Ф They tried hard to guess the deeper meaning behind it. Can this be some famous tune, or just plain noise?"

✦✦✦

[Attack]

1-target attack. Deals 500% Mental DMG.

"Ф They tried hard to guess the deeper meaning behind it, but I was just mashing the keys!"

Challenge for the Eyes

✦✧✧

[Attack]

Mass attack. Deals 150% Mental DMG to 2 enemies.

"Ф They attempted to stare at the sun."

✦✦✧

[Attack]

Mass attack. Deals 175% Mental DMG to 2 enemies. When the caster scores a critical hit, Moxie -1 for the targets.

"Ф They attempted to stare at the sun, but it was in vain."

✦✦✦

[Attack]

Mass attack. Deals 275% Mental DMG to 2 enemies. When the caster scores a critical hit, Moxie -2 for the targets.

"Ф They attempted to stare at the sun, but it was in vain. Better cover your eyes!"

Inheritance

Listen to New Stuff

Insight I

If the caster has not acted in a round, enters [Restless Heart] status at the end of the round.

Materials

Sharpodontyx18000
Page of Starlit Ascentx6
Magnesia Crystalx6
Esoteric Bonesx5

Listen to New Stuff

Insight II

Critical DMG +15% when the caster enters battle.

Materials

Sharpodontyx40000
Scroll of Starlit Ascentx10
Rough Silver Ingotx4
Prophetic Birdx5

Listen to New Stuff

Insight III

When [Restless Heart] status is dispelled, Moxie +1.

Materials

Sharpodontyx200000
Tome of Starlit Ascentx16
Platinum Ouijax5
Mistilteinnx3

Special effects

Restless Heart:

Critical Rate +50%. Excess Critical Rate is converted to Critical DMG. Cancels after scoring a critical.

Euphoria

Regulus has one or more Euphoria upgrades available that amplify their base skills.

As Regulus Shines

Euphoria upgrade

Tier I

Gain Max Eureka +5. At the start of the round, gain Eureka +4. Whenever an ally consumes Eureka, accumulate points of [Inspiration].
When entering battle, accumulate 3 points of [Inspiration].
Starting from the second round, at the start of each round, generates a [Precast Incantation] – [Rock Lives Forever!].
[Rock Lives Forever!]: Grants this round’s [Impromptu Incantation] the number of [Inspiration] points on the incantation with the most [Inspiration] points that was not cast last round.
When entering battle, gains [Restless Heart]; changes [Restless Heart] to dispel after an attack does not score a critical hit.
[Listen to New Stuff]’s Insight III effect changes: At the start of the round, if [Restless Heart] is active, gains 1 stack of [Sturdiness].

Tier II

After casting [Treat for the Ears] or [Challenge for the Eyes], consumes 2 Eureka and grants attack instance +1 to [Impromptu Incantation] for the round.

Tier III

After casting [Sleepless Rave], grants 8 points of [Inspiration] to [Impromptu Incantation] for the round.

Tier IV

At the start of the round, grants the adjacent ally in front the ability to inflict [Rockin’ Spotlight] on the main target for 1 round.
[Rockin’ Spotlight]: Impromptu Incantations target this unit with priority.

Portray

Regulus Portray

Portray details

Lv. 1:

Sleepless Rave: Mental DMG increased to 400%.

Lv. 2:

Treat for the Ears: At Incantation rank 1/2/3, Mental DMG increased to 220/330/550%.

Lv. 3:

Challenge for the Eyes: At Incantation rank 1/2/3, Mental DMG increased to 165/195/300%.

Lv. 4:

Sleepless Rave: Mental DMG increased to 450%.

Lv. 5:

Sleepless Rave: [Riot and Roll] +1 round for all allies.

Gallery

Insight 0

Insight 2

Review

Regulus holds a good balance between damage and utility for the team. She only needs Insight 1 to make use of her [Restless Heart] passive, which grants +50% Critical Rate when Regulus doesn’t act for one round. That makes Regulus a very AP-generous character, as it allows the player to use that round to manage cards and prepare for a burst window or focus on other teammates’ actions. She also has the rare trait of turning excess of Critical Rate into Critical DMG, allowing her personal damage to be boosted further when being part of Crit. Oriented teams.

Try to take advantage of this downtime to always have the skill “Challenge for the Eyes” at level 2 or above. While “Treat for the Ears” is Regulus’ main damage source, “Challenge for the Eyes” on the other hand doesn’t deal much damage by itself. It can, however, reduce up to 2 moxie from the enemy when scoring a critical hit, thus allowing Regulus to negate Ultimates, even from enemies who are immune to crowd control.

Finally, “Sleepless Rave” deals damage to all enemies while applying the effect [Riot and Roll] on all allies for one round, allowing them to dodge any non-Ultimate attacks. This tool becomes progressively more useful later in the game, when powerful attacks from the enemy team become constant. Just keep in mind that characters under [Conceal] will leave that status once acting (Regulus herself included). That means, if your goal is to avoid attacks, use the Ult as your last action in the round.

Pros & Cons

Pros

Versatile, good synergy with a variety of teams, but especially with crit-oriented teams.
Crit-oriented damage dealer, with free +50% crit-rate up from her passive.
AP Generous, since she only tends to act every other round.
Can reduce Moxie from enemies and give [Conceal] to allies.

Cons

Has to spend every other round without attacking in order to make use of her passive, which can slow down the fight.
[Conceal] isn't really needed until later in the game.

Ratings

Overall

Resonance Builds

Build 1 - Regulus – Euphoria Impromptu

Level

R10 - Genuinity (Incantation Might/Penetration Rate)

Code

AiwBLCEsQSUAPTD7QiYTKTM0NTRVQwNDFUUF

A mix of Critical Rate/DMG, ATK, and Incantation Might. NOTE: If you unlock a Resonance Pattern on one Impromptu teammate, be prepared to unlock it for EVERYONE on the team. The Impromptu Incantation scales off your whole team's stats, so hyper-investing in just one of your teammates is a bad idea.

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

ACwBLCEsQSUAPTD7QiYTKTM0NTRVQwNDFUUF

Build 2 - Regulus – Full Crit

Level

R10 – Genuinity (Incantation Might/Penetration Rate)

Code

Avg0LVQpBS0DJAAtECYgQRNCJDgyPGFKYEFBREA

Prioritizes Critical Rate and Critical DMG. Regulus is in the weird spot of being a crit-based character with a T-shaped main piece instead of a +, meaning she misses out on any Resonance Pattern that benefits her Critical DMG. This build gives 28% Crit Rate; combined with [Restless Heart] and her innate Crit Rate, Regulus gets a total 95% CR. If you’re considering running Regulus with a CR buffer like Mercuria, you might want to consider the DMG Bonus build instead.

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

AC1UKQUtAyQALRAmIEETQiQ4MjxhSmBBQURA+DQ

Build 3 - Regulus – DMG Bonus

Level

R10 - Inspire (DMG Bonus)

Code

BC1SLVT4NCcFNAQ0AjsjJhEtMTtQSgE9AEBA

Prioritizes DMG Bonus and some ATK. Features 11% less Crit Rate in favor of 10% more DMG Bonus and 70 more ATK. At a total of around 84% Crit Rate, Regulus can more comfortably get buffs from supports like Vila and Mercuria without overcapping Crit Rate too much.

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

AC1SLVQnBTQENAI7IyYRLTE7UEoBPQBAQPg0

Build 4 - Regulus – High ATK

Level

R10 - Hyper (ATK)

Code

A/gkNFU0BSVEKwQ4Qj0DQVFBMT0wOBEuAEoASgI

Prioritizes ATK. Another way of avoiding overcapping on Crit Rate is to invest in ATK instead, especially if you have other sources of DMG Bonus. This build features almost double the ATK boost the Full Crit build offers. As a lot of ATK pieces also feature HP and DEF, this build is also considerably bulkier.

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

ADRVNAUlRCsEOEI9A0FRQTE9MDgRLgBKAEoC+CQ

Psychubes

Aurora After Winter

Belt It Out

Blasphemer of Night

Hopscotch

Brave New World

Comments

If you have a max amplification Long Night Talk, you can equip that on Kiperina and have Euphoria Regulus run Aurora After Winter instead. Regulus can't get any ATK, but her AFK playstyle makes it great for her to equip this psychube for team-wide Critical DMG.

In every other situation, Euphoria Regulus wants to use Belt It Out. A team-wide +2–4% DMG Bonus for every Star ally on the team synergizes perfectly with Impromptu's playstyle.

If you don't have those options, any other Incantation Might psychube works on Euphoria Regulus. Blasphemer of Night works great due to its synergy with her debuff and Aleph's [Interpretation].

Otherwise, Hopscotch is another cheap option. Because Impromptu doesn't use Ultimate Might, you don't have to worry about stacking it up. This psychube also works on pre-Euphoria Regulus.

Brave New World is another great general option for Pre-Euphoria Regulus. 20–40% Incantation Might on the next incantation after her ultimate is great—just remember not to cash that buff in on the same turn or else [Riot and Roll] will be dispelled.

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

266

404

444

677

717

1009

1046

1186

1257

1907

2103

3197

3393

4768

4947

5609

Reality DEF

101

153

168

257

272

382

395

449

Mental DEF

136

206

227

345

366

514

533

605

Critical Technique

368

417

466

515

Critical Rate

12.3%

13.93%

15.56%

17.2%

Critical DMG

148.4%

150.85%

153.3%

155.75%

Teams

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

S+

Pew Pew Pew

Niche 1: Inspiration || Niche 2: Crit

Characters

About the team

Probably one of the strongest teams available at this time. Utilizes the large amounts of Crit stats stacked by Barcarola and Kiperina (and the latter's Crit Conversion) topped with Aleph's [Interpretation], Regulus' [Rockin' Spotlight] and additional Crit buffs to nuke through anything in the game. Kept incredibly safe by Kiperina's ridiculous [Shield] values. Kiperina CAN be exchanged for Fatutu or Ezra, but this causes amounts of DMG loss. In addition, Aleph can be traded for FP for Inspiration and Regulus(E) can be traded for Voyager(E).

Team 24

Impromptu - Core

Niche 1: Inspiration || Niche 2: Support Core

Characters

About the team

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

Team Database

Synergy

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

Lore

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