Spin Energy (The Core Resource) The miraculous feats of the Spin are not infinite; they require intense concentration and physical exertion, represented mechanically by a resource called Spin Energy.
The Physical Phenomenon: Spin Energy is the mystic and mathematical force generated by replicating the Golden Ratio. Unlike innate magic or the spiritual projection of Stands, Spin is a purely physical phenomenon achieved through absolute mastery of rotational momentum.
Fueling the Rotation: As a Spin User, players channel this energy to propel Steel Balls at lethal velocities, manipulate biological tissues, and distort physical space. The GM must actively track and deduct this resource whenever a player utilizes their high-level Subclass Features.
The Cost of Misalignment Because the Spin relies entirely on flawless mathematics and physical exertion, running out of Spin Energy represents a break in the user's form.
Depletion: This resource reflects a player's deep mechanical focus and geometric alignment. If a player completely depletes their Spin Energy pool, their focus shatters. While they can theoretically still throw their Steel Balls as normal physical weapons, the projectiles completely lose their supernatural, reality-bending edge until the user can rest and realign themselves with the Golden Ratio.