S-rank Tier S Cosmos

Zero (F)

Attack

Cosmos striker with sharp burst flourishes—her variant plays confident and forward, like a comet cutting through a fight before settling into a steady glow.

Build and progression guide

Cosmos striker with comet-bright bursts—readable rotations and crit-friendly modules feel rewarding early.

Recommended Disks

Day Off (S)

Best overall on neverness.gg (Esper Zero build): Cosmos burst Arc that fits her on-field DPS rhythm.
The Rain That Shook the World (S)

Strong alternative when you want a more generic high-ATK burst line.

Recommended Modules

S-tier Module line

Attack and crit stats keep burst moments feeling sharp.
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

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.
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.
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.