code/datums/mutations/_mutations.dm

NEGATIVE_STABILITY_MINI	Negatives that are virtually harmless and mostly just funny (language)
NEGATIVE_STABILITY_MINOR	Negatives that are slightly annoying (unused)
NEGATIVE_STABILITY_MODERATE	Negatives that present an uncommon or weak, consistent hindrance to gameplay (cough, paranoia)
NEGATIVE_STABILITY_MAJOR	Negatives that present a major consistent hindrance to gameplay (deaf, mute, acid flesh)
POSITIVE_INSTABILITY_MINI	Positives that provide basically no benefit (glowy)
POSITIVE_INSTABILITY_MINOR	Positives that are niche in application or useful in rare circumstances (parlor tricks, geladikinesis, autotomy)
POSITIVE_INSTABILITY_MODERATE	Positives that provide a new ability that's roughly par with station equipment (insulated, cryokinesis)
POSITIVE_INSTABILITY_MAJOR	Positives that are unique, very powerful, and noticeably change combat/gameplay (hulk, tk)

Define Details

Negatives that present a major consistent hindrance to gameplay (deaf, mute, acid flesh)

Negatives that are virtually harmless and mostly just funny (language)

Negatives that are slightly annoying (unused)

Negatives that present an uncommon or weak, consistent hindrance to gameplay (cough, paranoia)

Positives that are unique, very powerful, and noticeably change combat/gameplay (hulk, tk)

Positives that provide basically no benefit (glowy)

Positives that are niche in application or useful in rare circumstances (parlor tricks, geladikinesis, autotomy)

Positives that provide a new ability that's roughly par with station equipment (insulated, cryokinesis)