Star Savior — Break Skill, Toughness & Nova Burst Guide

Mastering the Toughness, Break Skill, and Nova Burst systems represents the premier tactical avenue to triumph over high-difficulty encounters where your Combat Power sits well below enemy requirements.

The Toughness Gauge Architecture

Every combatant - both friendly Saviors and enemy combatants - possesses a dedicated Toughness gauge (frequently designated as Super Armor):

• Standard Saviors and basic monsters possess 3 Toughness.
• Elite adversaries, Subjugation targets, and World Bosses feature substantially larger, multi-layered Toughness bars.
• Damage Requirement: Only strikes that successfully inflict direct damage (Normal or Critical hits) deplete Toughness. Attacks that miss, hits absorbed by complete damage nullification, and non-damaging supportive abilities inflict 0 Toughness DMG.

By default, offensive strikes only chip away at Toughness when precise combat conditions are satisfied:

• Attribute Advantage ("WEAK" Trigger): Striking an enemy with a superior element (Sun > Star > Moon > Sun, or Order ↔ Chaos) confers +1 Toughness DMG on that attack.
• Attribute Disadvantage Penalty: Striking with a weak elemental matchup inflicts 0 Toughness DMG. Even if a Savior's skill inherently features bonus Toughness shredding, elemental disadvantage completely negates it!
• Innate Skill & Class Effects: Specific operatives (especially Strikers like Roberta and Tanya, or Casters like Omega) possess passives or skills that bestow +1 Fixed Toughness DMG on attack, applying even against neutral elemental alignments.
• Follow-Up Attacks (FUA) Stack Toughness DMG: If a Savior like Bunnygirl Charlotte or Asherah: Waltz of Starlight executes a Basic Attack under Attribute Advantage (1 Toughness DMG) and triggers an immediate Follow-Up Attack against that weak target, the follow-up inflicts another 1 Toughness DMG (scaling up to 3 total Toughness DMG when amplified with Nova Burst)!
• Potentials & Journey Relics: Equipping Unique Potentials (such as Roberta's Disaster Response Protocol or Fei's Lone Seeker) or XX3 Bracers in Journey mode adds flat Toughness or Toughness DMG.

When an adversary's Toughness gauge reaches 0, they right away enter the Break state:

• Their turn order is heavily delayed and disrupted.
• They suffer dramatically heightened Break Damage multipliers from all incoming attacks throughout the duration.
• Once the adversary completes their disrupted recovery, their Toughness gauge refills to 100%.

Generating Break Points

Shattering an enemy's Super Armor directly charges your squad's collective Break Points:

• Normal Enemy Break: Awards +1 Break Point.
• Boss Enemy Break: Awards +3 Break Points (right away priming your Break Skill for deployment!).

Before examining Break Skills, understanding Nova Force is essential, as several Break Skills interface with this resource directly.

What's Nova Force?

Nova Force is a shared team resource gauge that caps at 12 Nova Force.

How to Earn Nova Force

• Executing any Special Skill (Skill 2) or Hyper Skill (Ultimate / Skill 3) grants +1 Nova Force.
• Using a standard Basic Attack (Skill 1) generates 0 Nova Force.
• Casting specific Break Skills (such as Singularity Observation or Dimensional Assault) instantly generates +4 Nova Force.

How to Activate Nova Burst (Hotkey: V)

During any active Savior's turn, expend 4 Nova Force to engage Nova Burst. (Once triggered, Nova Burst can't be canceled and automatically clears after that skill completes).

Combat Amplifications from Nova Burst

• +15% Skill Damage: Confers a flat +15% Damage Dealt multiplier to that active skill (doesn't apply to subsequent follow-up strikes).
• Common Enhancement (Attack / Special Skills): Bestows +1 Fixed Toughness DMG on offensive actions, or restores 1 Toughness to self on Defender and Supporter abilities.
• Unique Enhancement (Highlight / Hyper Skill): Unlocks that operative's exclusive Unique Nova Burst Effect—such as 100% guaranteed debuff hit rates, team-wide energy shields, extra turns, camouflage stealth, or catastrophic multi-bar Toughness shredding!

Your 4-unit squad equips exactly 1 Break Skill at a time. Upon amassing 3 Break Points, Captains can unleash their Break Skill on the following friendly turn.

Universal Break Skill Mechanics

• Team-Wide Stat Scaling: Break Skills scale off the combined aggregate ATK or HP of all 4 Saviors on your team. (Note: Damaging Break Skills target all enemies at once and are subject to the standard AoE divisor of /4 per target).
• Zero Counterattacks: Unleashing a Break Skill never triggers enemy counterattacks or reactive traps.
• Cooldown: Casting consumes all 3 Break Points and incurs an 8-turn recovery cooldown.
• Domain Deployment: Every Break Skill establishes a continuous field Domain. While individual on-use perks (like Omega Protocol) persist for 2 full personal turns on each Savior, field Domain duration (5 turns) ticks down across collective turns on the battlefield.

Follow these acquisition steps and situational priorities to maximize tactical efficacy:

How to Unlock Break Skills

• 1. Clear Operation Stage 3-7 to unlock the tactical curriculum.
• 2. Navigate to Shop → Apocalypse / Candle Square Shop → Observation Records and purchase Break Skill Support Plans (5 Plans are required to unlock skills like Cube Overload or Star Piercer).
• 3. Open HQ → Tactical Analysis → Break Skill to finalize unlock authorization. (Priority Rule: Unlocking new Break Skills offers vastly superior combat returns compared to leveling existing skills from Lv. 1 to Lv. 10!).

Best Break Skill by Encounter Category

• Best for General PvE, Auto-Battle & High-Deficit Campaign — Cube Overload: The undisputed #1 all-around Break Skill. Restores party health, supplies a massive +10% to +20% Turn Speed acceleration, and grants 2 individual turns of +15% ATK and +15% Effect Hit. Also excels on Gauntlet PvP defense stall teams.
• Best for PvP Cleave, Speed-Farming & Striker/Ranger Formations — Star Piercer: The instant +20% Action Gauge push allows your entire lineup to cut ahead of enemy turns, while showering Strikers and Rangers with up to +20% CRIT Rate and CRIT DMG.
• Best for Manual Boss Encounters & Cosmo Gate Toughness Shredding — Dimensional Assault: Elite Captains employ a specialized manual sequence with this skill: Never activate Dimensional Assault while the boss is already broken! Wait until the boss recovers from Break and refills their Toughness gauge, then right away trigger Dimensional Assault. Because its Domain confers +1 Toughness DMG to all hits (including multi-hit follow-ups from Asherah: Waltz of Starlight or Bunnygirl Charlotte) alongside +4 Nova Force, your squad can shred 8 to 9 points of fresh boss Toughness in a single turn sequence!