The Core Concept of Spin The Spin is an ancient, esoteric discipline rooted in the absolute perfection of mathematics and nature. Originating historically as a specialized method for both medical treatment and humane execution, it is the art of applying endless rotational energy to objects—most notably, specially crafted Steel Balls. Unlike Stand Users who rely on the manifestation of their internal spiritual psyche, Spin Users harness the geometric perfection of the Golden Ratio. Mechanically, the Spin User is a non-spellcaster class that utilizes a d8 Hit Die.
Learning the Spin The Spin is an art that is easy to learn but difficult to master. Anyone can acquire the basics if they find the right material. If a character spends 24 hours studying the uncommon item "The Golden Ratio for Dummies," they learn the basics of the technique and unlock the Spin class. Additionally, for existing Spin Users, referencing this comprehensive guide over a short rest grants advantage on their next attack roll utilizing the Spin, usable once per Long Rest.
The Disciplines of Rotation (Subclasses) At Level 3, a Spin User must choose a specialized subclass to dictate how they apply their rotational energy in combat:
Neapolitan Guard Style: Developed by elite royal bodyguards, this style utilizes specialized "Wrecking Balls"—Steel Balls embedded with smaller, detachable satellite pins. Practitioners focus heavily on battlefield control, area denial, and the terrifying art of left-side ataxia, a neurological condition that completely blinds an enemy's brain to anything occurring on the left side of their body.
Zeppeli Executioner Style: Originating from a prestigious lineage of royal executioners and medical savants, this style treats the Spin as an exact science of life and death. By utilizing the Spin to map and manipulate the physical anatomy of living organisms, practitioners can flawlessly bypass armor, heal severe biological trauma, or systematically shatter an opponent's skeletal structure.
Player Agency & Mechanical Flexibility (GM Directives) For the GM (Franz), running a Spin User requires a balance between strict mechanics and improvisational freedom:
Feature Cross-Referencing: When a player declares a specific combat ability or attack, the GM must refer directly to the player's Subclass Features to apply the hard mechanics, ranges, and resource costs written there.
Rewarding Creativity: The Spin is an incredibly versatile, physics-based power. The GM must actively reward creativity and out-of-the-box thinking. If a player describes a mathematically sound, environmentally clever, or highly stylized way to use rotational energy outside of their strict class features—such as spinning water out of clothes, carving a perfect circle to drop an enemy through a floor, or curving an object around a wall—the GM should absolutely allow it by calling for an appropriate skill check and leaning into the "Rule of Cool."