Instead of tears, Isaac swings a sword. Charging does a spin attack and fires a projectile, and a projectile is sometimes fired with normal swings if Isaac has no empty red hearts.
Quote
"Divine blade"
Effects
Replaces Isaac's tears with a sword he can swing in front of him.
The swing does 3x Isaac's damage +3.5 and deals knockback to both enemies and Isaac if it hits.
The sword can be swung as rapidly as the fire button can be tapped
The sword swing can collect pickups.
If Isaac's total health is equal to or greater than his number of Red Heart containers (same rule as regular Challenge Rooms), the sword fires a projectile when swung.
The projectile deals damage equal to Isaac's damage +2, and has a cooldown equal to 2x Isaac's normal tear rate.
Holding an attack button charges a spin attack, ready when the sword flashes, which damages all enemies around Isaac. It also deflects enemy projectiles and launches a projectile regardless of Isaac's current health.
The circular swing deals 8x Isaac's damage +10, and the projectile created from it deals 4x Isaac's damage +4.
The charge time is based on Isaac's tears stat, at ~4x Isaac's normal tear rate.
While charging, the sword will damage the first enemy that contacts it. This will cancel the spin attack.
Synergies
20/20 - Isaac spins one additional time for each extra tear, firing extra projectiles on each spin. No effect on the normal swing.
The Inner Eye - Isaac spins one additional time for each extra tear, firing extra projectiles on each spin. No effect on the normal swing.
Mutant Spider - Isaac spins one additional time for each extra tear, firing extra projectiles on each spin. No effect on the normal swing.
The Wiz - Isaac spins one additional time for each extra tear, firing extra projectiles on each spin. No effect on the normal swing.
Cricket's Body - The fired projectile will burst into multiple swords.
Decap Attack - The body holds the sword while the head will only block projectiles.
Explosivo - The fired projectile can take on Explosivo's effects. The sword swing can leave behind Explosivo tears.
Eye Sore - Random chance to swing extra swords in random directions.
Godhead - The fired projectile receives Godhead effects.
Loki's Horns - Random chance upon swinging to have a sword in all 4 cardinal directions. Performing a spin attack when this occurs results in a 4-way spin.
Mom's Eye - An additional sword is added to Isaac's back, and can be swung as normal.
Mom's Knife - When doing the spin attack, Isaac throws the sword a short distance which spins as it travels. Mom's Knife + Technology: A technology laser connects Isaac and the sword while it's being thrown. Mom's Knife + Brimstone: Launches a barrage of knives from Isaac's mouth after doing the spin attack.
Polyphemus - The sword and fired projectile become gigantic, swing rate and charge time remains the same.