Spin is a utility like hamon and vampire. To obtain spin, you need to pick up a steel ball. Steel balls are rarer than Caesar’s headband and the stone mask. Spin is the only utility with ranged moves. If you have spin, all projectiles can moves during time stop.
Steel Ball: You throw a steel balls.
Spin Tornado: You throw both steel balls at high speeds and do high damage to you opponent.
Spin: You hold the Z button to charge your spin meter.
Golden Spin: When you activate golden spin, your spin meter drops rapidly but all your spin attacks do a small AOE.
Having spin active will increase your damage with a stand and melee.