MewgenicsWiki

Passive

Black Fetin

Black Fetin is the passive effect tied to the Black Fetin disorder, acquired exclusively through a critical success on the Volcano sacrifice in The Jurassic. Mechanically, it registers two…

Black Fetin is the passive effect tied to the Black Fetin disorder, acquired exclusively through a critical success on the Volcano sacrifice in The Jurassic. Mechanically, it registers two independent triggers. The StatusOnAllyCatDeath trigger watches for any allied cat entering a downed state and responds by completely refilling the passive holder's mana pool (FillMana: 1, meaning 100% restore). Alongside this, the StatusEachTurnBegin trigger rolls a 10% base chance at the start of every turn to inflict one turn of Uncontrollable, temporarily replacing player input with AI decision-making. Both triggers are hardcoded into the passive and cannot be separated.

The mana restoration fires on any ally downed event, regardless of what caused it. An ally killed by enemy damage, environmental hazards, or self-inflicted abilities like Flatline, Play Dead, and Seppuku all qualify. The refill is complete: no matter how empty the mana bar, it returns to maximum in one instant. This makes Black Fetin's passive uniquely exploitable. Teams running intentional-down abilities can cycle an ally through downed and revived states multiple times per adventure, giving the Black Fetin holder repeated full mana resets. The Conditional_BadRoll for Uncontrollable follows standard Luck scaling, dropping from 10% at neutral Luck to 1% at 15 Luck and climbing steeply into negative Luck territory.

In practice, Black Fetin's passive creates a feedback loop when combined with the right team composition. A Necromancer ally uses Seppuku to down itself, the Black Fetin cat's mana refills instantly, and the Necromancer is revived to repeat the cycle. This effectively removes mana as a resource constraint for one cat on the team, enabling sustained use of expensive abilities that would normally require careful rationing. Even without deliberate downing strategies, the passive serves as a powerful insurance policy: losing a teammate in a difficult fight immediately arms the surviving Black Fetin cat with a full mana bar to mount a counterattack. The passive has only a single tier with no upgrades, so its power level is fixed from the moment it is acquired.

Details

Tiers

Tier LevelEffectPassive Effects
1You have a 10% to be AI controlled each turn.StatusOnAllyCatDeath: {"FillMana":1}; StatusEachTurnBegin: {"Conditional_BadRoll":{"odds":0.1,"Temporary":{"status":"Uncontrollable","stacks":1,"turns":1,"expires_on_end_turn":"true"}}}

Quick Facts

Type
Passive
Confidence
High
Verified
Apr 1, 2026