Starlight Billy Build Guide: Best W-Engines, Drive Discs & Teams

Starlight - Billy is a massive shift from his original A-Rank version. As an S-Rank Physical Rupture agent from the Cunning Hares, he redefines the meta with a unique HP-draining mechanic. Your main DPS completely ignores traditional Attack (ATK) stats. Instead, this character uses his own health pool to fuel his damage output.

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His playstyle revolves around a high-risk, high-reward burst window. He leaps onto a motorcycle to crash into enemies, constantly draining his health in exchange for massive buffs. Because all of his damage converts into Sheer DMG, this hyper-carry cuts right through enemy defenses, making him one of the most lethal boss killers in the game.
Starlight Billy character infographic and overview of his HP-draining Physical Rupture mechanics

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How Do Starlight - Billy's Skills Work?

To master this carry, you have to understand his stance-switching and health management. Here is a breakdown of his core mechanics:

Core Passive (Knight's Resolve): He converts his Max HP into Sheer Force (1 HP = 0.1 Sheer Force). All Physical damage he deals becomes Sheer DMG, which completely ignores enemy DEF.
Special Attack (Drive Suppression): This is your main steroid. It consumes 16% of his Max HP to summon a motorcycle. In return, he gains a massive 90% CRIT DMG buff for 45 seconds. When his HP drops to 25% or lower, he takes 50% less damage.
Basic Attack (Full-Throttle Starlight): As you attack, you build up a Determination gauge. At 100 points, holding the attack button unleashes a devastating invulnerable laser beam.
Self-Healing (EX Special Attacks): He is not as squishy as he looks. Using High-Traction Wheels instantly restores 30% of his Max HP, and Rocking Footwork restores 15%.

Best Combat Rotation:

Enter the field and immediately use Drive Suppression to drain health and secure your 90% CRIT DMG buff.
Spam your Basic Attacks and Dodge Counters to build up Determination and Adrenaline.
During the stun window, unleash your EX Special Attacks (like Cool Wheelie) to dump your damage and heal your health back up to safe levels.
End the rotation with Full-Throttle Starlight or his Ultimate to nuke the enemy.

What is the Best Weapon for Starlight - Billy?

Recommended W-Engines for Starlight Billy that boost Max HP and CRIT stats
Because this unit relies entirely on Max HP to calculate his Sheer Force, standard ATK W-Engines are practically useless. You need weapons that boost health or critical stats. Here are the top four recommendations:

Best-in-Slot: Starlight Rider Faceplate (S-Rank)
This signature weapon provides a massive 30% Max HP boost and increases CRIT Rate by 20%. Whenever he launches a Special Attack, his Physical Sheer DMG increases by 10% (stacking twice). It has perfect synergy with his aggressive, HP-burning rotation.
Alternative S-Rank: Qingming Birdcage (S-Rank)
While its passive effect boosts Ether Sheer DMG, it acts as an incredible stat stick for this character. It offers 30% Max HP and a 20% CRIT Rate increase, making it a highly competitive option for sheer stats.
Alternative S-Rank: Wrathful Vajra (S-Rank)
Similar to the Birdcage, this weapon provides 30% Max HP and a 20% CRIT Rate boost. Although the Fire Sheer DMG passive does not apply to him, the raw health and critical stats perfectly support his HP-scaling kit.
Strong A-Rank Alternative: Radiowave Journey (A-Rank)
This is a fantastic option. It grants 25% Max HP. When you launch a Chain Attack or Ultimate, it grants stacks that flat-out increase his Sheer Force by 80 per stack, up to 3 stacks.

Which Gear and Stats Maximize Starlight - Billy's Damage?

Recommended Drive Discs and optimal stats prioritizing HP and CRIT for Starlight Billy

To get the most out of your main DPS, you must stack HP% across the board while maintaining a healthy CRIT ratio.

Recommended Artifact Sets:

4-Piece Yunkui Tales: The 2-piece gives +10% HP. The 4-piece increases CRIT Rate when using EX Specials, Chain Attacks, or Ultimates. At max stacks, it boosts Sheer DMG by 10%.
2-Piece Branch & Blade Song: Gives a flat +16% CRIT DMG to make your burst hits hit even harder.

Main Stat & Sub-Stat Priorities:

Disc 4: CRIT Rate / CRIT DMG
Disc 5: Physical DMG / HP%
Disc 6: HP%
Sub-stats Priority: CRIT Rate / CRIT DMG > HP% > Flat HP > ATK%

What Are the Best Team Comps for Starlight - Billy?

Best team composition for Starlight Billy including Lucia for support and Dialyn for stun

To keep this character alive and dealing maximum damage, you need teammates who enable his HP scaling and provide Stun utility.

The Starlight Service Team:

Main DPS: Starlight - Billy
Support: Lucia
Stun: Dialyn

Team Synergy Explained:
Lucia is his absolute best friend. Her Darkbreaker state directly increases his Sheer Force based on her own Max HP. Furthermore, her Ultimate drops a Starlight Convergence healing zone, which safely offsets his motorcycle HP drain. Dialyn acts as the perfect offensive enabler. She gathers Positive Reviews to force Chain Attacks to upgrade into Ultimates. When Dialyn pops her abilities, she triggers an Overwhelmingly Positive buff that increases the entire squad's damage by 40%. Together, they make him an unstoppable tank.

What Materials Are Needed to Upgrade Starlight - Billy?

List of pre-farming materials required to fully upgrade Starlight Billy and his W-Engine

To fully max out this hero to Level 60 with Level 12 skills, and to upgrade his signature W-Engine, you will need to gather the following resources:

Agent Upgrade Materials

Material Category	Item Name	Total Amount Needed (Lv. 60 + Max Skills)
Currency	Dennies	3,705,000
Skill Chips	Physical Chips (Basic / Advanced / Specialized)	25 / 75 / 250
Promotion Seals	Rupture Certification Seals (Basic / Advanced / Arbiter)	4 / 32 / 30
Weekly Boss Drops	Higher Dimensional Data: Bloodstained Miasma Feather	60
Core Enhancements	Hamster Cage Pass / Clouded Crystalline Substance	5 / 9

Signature W-Engine Materials (Starlight Rider Faceplate)

Material Category	Item Name	Total Amount Needed (Lv. 60)
Currency	Dennies	400,000
Components	Rupture Components (Basic / Reinforced / Specialized)	4 / 32 / 30
Energy Modules	W-Engine Battery / Power Supply / Energy Module	5 / 4 / 199

Which Constellations (Awakenings) Are Worth Getting?

If you are looking to invest heavily into your account, his Cinemas provide massive spikes to his utility and damage.

Level	Effect	Value/Verdict
1. Heroic Entrance	Grants 60 Adrenaline on entry. EX Specials ignore 18% Physical RES.	High. Amazing quality-of-life and resistance shred.
2. Wasteland Automaton	Major skills deal 50% more DMG. Unlocks the Turbocharged effect for huge CRIT bursts.	Excellent. The best stopping point for low-spenders.
3. Knight's Chivalry	Skill Levels +2.	Average. A standard damage bump.
4. Flames of Justice	Drive Suppression grants extra CRIT DMG. Slowly heals off-field if HP is below 35%.	Good. Fixes his squishiness without strictly needing a healer.
5. Radiant Armaments	Skill Levels +2.	Average.
6. Starlight Knight	Ultimate and Basic Sheer DMG +18%. Gains stacks that add 100% Sheer Force as extra Physical DMG.	God Tier. Turns him into the ultimate, unkillable boss shredder.

Is Starlight - Billy Worth Pulling?

Yes, absolutely.

Because this physical carry deals Sheer DMG that completely ignores enemy defense, he will cut through highly armored endgame targets like butter. While his HP-draining mechanic might feel intimidating at first, his built-in heals, invincibility frames, and 50% damage reduction make him surprisingly durable. If your roster lacks a top-tier hyper-carry to anchor your boss-killing teams, he is a fantastic investment.

Frequently Asked Questions (FAQ)

Q: Why is my ATK stat so low on him? Is my build wrong?: A: Not at all! This character's Core Passive ignores standard ATK completely. He converts his Max HP directly into Sheer Force, which dictates all of his damage multipliers. Always stack health instead of attack.
Q: Does he require a dedicated healer since his skills drain his health?: A: It helps, but it is not required. While in combat, using EX Special Attacks like High-Traction Wheels immediately restores a huge chunk of his Max HP. Once you learn his rotation, you can manage his squishiness entirely on your own.
Q: What happens if I accidentally drain his health to zero during his motorcycle stance?: A: You won't die. If his HP gets too low, his stance will end. Additionally, he has a built-in cheat death mechanic. If he takes fatal damage, he immediately gains a shield equal to 180% of his Max HP, keeping him safely in the fight.