Expanded Beast Trait System

Source: https://vamp.bynightstudios.com/vampire/library/expandedbeasttraitsystem

Each human holds the capacity for right and wrong, good and evil. A tentative balance exists between the two, with both virtue and vice ruling emotions and actions. Vampire: The Masquerade is a game that focuses on the internal struggle between darkness and light, right and wrong, virtue and vice. This daily inner turmoil is mirrored in the conflict between Humanity and the Beast.

Humanity is defined in Mind's Eye Theatre: Vampire The Masquerade as a metric determining how much of a character's mortal soul remains, despite the Curse of Caine.
Beast traits represent the relative potency of a character's Beast, increasing as it actively strengthens or emerges.

System Rules

Tracking and Applying Beast Traits

The death of Humanity is achieved through a thousand cuts: a string of choices, each more important and dangerous than the last. Storytellers (and players) should observe and track the most severe sins committed by each character in a scene. Afterwards, the Storyteller should assign Beast traits accordingly and resolve degeneration challenges.

Aggravated Circumstances: Adjusting Beast Trait Awards

Storytellers may adjust the number of Beast traits awarded for any sin or simply lower a character's Humanity if they feel it is warranted. Examples:

Excessive Cruelty: Being more savage and causing more pain than you must (+1 Beast traits)
Lack of Remorse: Celebrating and reveling in the Beast (+1 Beast traits)
Repeat Offender: You've engaged in murder, mutilation, or possibly worse, over and over again (-1 Humanity).

Frenzy Checks: Riding the Wave

As a vampire accumulates Beast traits, her Beast becomes more and more active. A character who rides the wave seeks to satisfy her urges before they overcome her, rather than attempt to deny them outright. When confronted with a stimulus that would cause a frenzy check, players may choose instead to ride the wave. If they do, they skip the frenzy check, but must instead react in an extreme and dramatic fashion to the situation.

Riding the Wave in Different Situations

Rage Frenzy: She must physically attack either the source of her frenzy or a nearby enemy of her choice.
Hunger Frenzy: A character may ride the wave to assume a distinctly predatory demeanor and seek out the nearest source of mortal blood.
Fear Frenzy: A character riding the wave may shriek, yell, or recoil away from the offending source.

Source Book: MET - VTM - V2 Issue 1