Spirit Sword is an unlockable passive item in The Binding of Isaac, added in the Repentance DLC.

Replaces Isaac's tears with a sword that can be swung in front of him. The sword deals 3 × DamageStat + 3.5 damage and knocks back enemies it hits and Isaac.

The sword has no fire rate limitation and can be swung as fast as the fire button can be pressed.

The sword can be used to collect pickups.

If Isaac's total health is equal to or greater than his number of red heart containers, the sword will fire a projectile when swung. This projectile deals DamageStat + 2 damage and has a cooldown of 2x Isaac's normal tear rate.

Holding an attack button charges a spin attack which damages all enemies around Isaac, deflects enemy projectiles, and launches a projectile regardless of Isaac's health.

The circular swing deals 8 × DamageStat + 10 damage, while the projectile created from it deals 4 × DamageStat + 4.

The charge time is based on Isaac's tear stat, at ~4x Isaac's normal tear rate.

While charging, the sword will damage the first enemy that comes in contact with it, canceling the spin attack.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.

Complete challenge #39: Isaac's Awakening.

Spirit Sword can be found in the following item pools:

The following tags are applied to this item:

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Spirit Sword

• Replaces tears with a strong melee sword swing
• Can be charged and released to execute a higher damage spin attack
• Swings fire projectiles if Isaac's health is equal to or greater than his total red health
• Abyss: x1 locust 1.5x Isaac's damage

• Check out the item description on the external Isaac Wiki.