Recommended Disks
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Day Off (S)
Best overall on neverness.gg (Esper Zero build): Cosmos burst Arc that fits his on-field DPS rhythm.
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The Rain That Shook the World (S)
Strong alternative when you want a more generic high-ATK burst line.
← All characters 
S-rank Tier S Cosmos
Zero (M)
Attack
Cosmos attacker with an easy-to-follow rotation—fewer surprises, more momentum, which helps newcomers feel in control while they learn swap timing.
Build and progression guide
Cosmos striker with an easy rhythm—simple skill priority and steady modules help newcomers stay in control.
Recommended Modules
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S-tier Module line
Attack and crit stats keep burst moments feeling sharp.
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A-tier Module fallback
Attack and cycle rate are fine placeholders while better pieces arrive.
Esper skill priority
- 1
Ultimate
Main burst multiplier and finisher damage.
- 2
Skill
Core rotation damage and swap timing.
- 3
Basic Attack
Sustained on-field DPS between cooldowns.
- 4
Support Skill
Swap-in utility and secondary cycle effects.
What to farm first
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Esper EXP materials - Level cap and ascension breakpoints.
Where: Rabbit Hole > Character Growth simulations
Tip: Spend daily stamina here first until your main striker reaches the next ascension cap.
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Weapon/Arc upgrade mats - Main damage multiplier.
Where: Rabbit Hole > Arc/Weapon material anomalies
Tip: Farm on days matching your Arc upgrade route before side content.
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Module enhancement chips - Crit/ATK scaling.
Where: Anomaly Investigation > Module domains
Tip: Save module farming for after basics—modules matter most once your core team is settled.