Mewgenics · Boss

Mewgenics Stacy Boss Guide

Stacy is a build-a-boss encounter: the four Stacy Experiment choices you make before the fight determine her defensive buff, elemental moveset, stat profile, and final special mutation. The safest plan starts before combat by choosing a version your current team can counter.

Location: The Lab HP 125 Damage 5

Fast answer

Read this first

Main idea

Before entering the fight, review the four experiment choices and identify the exact Stacy variant you created. Open with spacing that matches her selected element instead of using a generic formation.

Biggest mistakes

Building a Stacy whose elemental immunity shuts down your main damage source.
Taking an elemental version without preparing for its charged area attack: Flamethrower, Shards of Ice, or Lightning Storm.

Winning line

Use the Stacy Experiment to create a boss version your current team can answer instead of automatically choosing the same options every run.
Match your positioning to the selected element: avoid Fire terrain buildup, respect Ice freeze range, or plan around Lightning Dash and parity-wide Lightning Storm.

About Stacy

The encounter is built around build-a-boss / adaptive element.

Burn Freeze Stun Bleed

Stacy stats

Core fight data for this boss.

Location: The Lab
HP: 125
Damage: 5
Movement: 4
Luck: 5
Size: 1x1

Mechanics snapshot

The main mechanics and triggers that shape this fight.

Main mechanics

Stacy Experiment Build Choice Elemental Variant Charged Attack Boss Buffs Special Mutation

Key triggers

Four Stacy Experiment choices before the fight determine Stacy's buff, element, stat tradeoff, and special mutation. Fire Stacy uses Spit Lava and Flamethrower; Ice Stacy uses Ice Breath and Shards of Ice; Lightning Stacy uses Lightning Dash and Lightning Storm. Choosing no element leaves Stacy with Melee Attack and Magic Missile while penalizing the cat that skipped the experiment choice. The final special choice can give Stacy an extra turn, Bleed plus counterattacks, or projectile reflection plus Magic Release.

Moves to know

Important attacks, abilities, or fight behaviors to recognize.

Fire: Spit Lava leaves Lava and Burn pressure; Flamethrower is a charged cone attack.

Ice: Ice Breath creates Ice and knockback pressure; Shards of Ice is a charged area attack that freezes.

Lightning: Lightning Dash crosses a cardinal line; Lightning Storm is a charged parity-wide Electric attack with a Stun chance.

Non-Elemental: Melee Attack and Magic Missile.

Special mutations: Double Head grants an extra turn each round; Third Paw adds Bleed and counterattacks; Mirror Shine adds projectile reflection and Magic Release.

Fight plan

The safest way to approach the fight without reading a wall of text.

Decision-first notes

Win conditions

Use the Stacy Experiment to create a boss version your current team can answer instead of automatically choosing the same options every run. Match your positioning to the selected element: avoid Fire terrain buildup, respect Ice freeze range, or plan around Lightning Dash and parity-wide Lightning Storm. Save your strongest damage window until after the selected charged ability resolves or whiffs.

Opener

Before entering the fight, review the four experiment choices and identify the exact Stacy variant you created.
Open with spacing that matches her selected element instead of using a generic formation.

Midfight

Track charged elemental abilities and reposition before they resolve.
Adapt your damage type and attack delivery to Stacy's elemental immunity and final special mutation.

Finisher

Commit burst after the dangerous charged attack has resolved and only when her special mutation cannot punish the finishing sequence.

Positioning & loadout

Run killers, positioning rules, and setup reminders.

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Run killers

Building a Stacy whose elemental immunity shuts down your main damage source.
Taking an elemental version without preparing for its charged area attack: Flamethrower, Shards of Ice, or Lightning Storm.
Giving Stacy a special mutation that directly punishes your team plan, such as extra turns against a slow team or projectile reflection against a ranged projectile setup.
Treating every Stacy fight as the same encounter instead of adjusting to the choices you made in the experiment.

Positioning rules

Fire: keep exit lanes open so lava and Burn do not trap your team into a shrinking safe area.
Ice: keep ranged pressure available because Shards of Ice can make close-range trading especially punishing.
Lightning: avoid giving Lightning Dash a clean line and reposition before a charged Lightning Storm resolves.
Mirror Shine: do not feed reflected projectiles; Double Head: plan for the extra action; Third Paw: avoid careless contact trades that feed Bleed and counters.