Spirit Sword

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, which can damage enemies who get hit, 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.

Notes

• Spirit Sword has the highest priority of all tear modifiers in the game, over Epic Fetus and Mom's Knife.
• Unlike most charge attacks, the direction of the attack can't be changed by pressing and holding a different attack button then releasing the old one. Instead, it will stay pointing the same direction until all attack buttons are released, either doing nothing or using the spin attack, or the sword touches and damages an enemy, dealing sword slash damage.
• Spirit Sword can be used to open Spiked Chests and Mimics without taking damage.
• Range upgrades move the hitbox of the sword forwards, including the spin attack. Enough range upgrades can leave a large blind spot directly in front of the sword.
• Only the projectile and spin attack are affected by tear rate, not the normal sword swing, meaning that items that increase damage but decrease tear rate, such as Polyphemus and Eve's Mascara, are much more effective when only using the swing. Additionally, items that do the inverse, such as Soy Milk and Almond Milk; are not as effective when only using the swing.
• Spirit Sword will deflect Mother's Fistula attack and will send it right back at her, entering a short sequence that allows to deal bonus damage, if executed correctly; see the page for more details.
• Spirit Sword is overridden by the Blindfolded effect (challenges like Cat Got Your Tongue or playing with Lilith)

Synergies

• 20/20/ (Keeper) Keeper/ The Inner Eye/ Mutant Spider/ The Wiz/Conjoined: Isaac spins one additional time for each extra tear, firing extra projectiles on each spin. No effect on the normal swing.
• C Section: Fetuses hold small swords and perform the charged spin attack as they travel.
• 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.
• Eye Sore: Random chance to swing extra swords in random directions.
• Haemolacria: Sword becomes larger. The projectile is now fired in an arc and splits on collision with enemies and obstacles.
• Holy Light: Both the sword swing and the projectile can trigger Holy Light.
• Homing tears (e.g. Spoon Bender): The projectile will be homing.
• Isaac's Tears: The item fires normal tears but can be charged as fast as the sword can be swung. Doing a spin attack will fully charge Isaac's Tears.
• Lachryphagy: The fired projectiles will combine and split.
• 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.
• Lost Contact: Sword swings reflect projectiles.
• Maw of the Void: An additional ring will appear upon fully charging it. Spin is delayed by a bit.
• 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.
  • Mom's Knife + Tech X: Full charge launches a sword surrounded by Tech X that swings back to Isaac.
• My Reflection: The fired projectile will return to Isaac.
• Polyphemus: The sword and fired projectile become gigantic. Charge time is increased, but swing rate remains the same. Swings will also shake the screen.
• Rubber Cement: The fired projectile bounces.
• Technology: Sword becomes a lightsaber. Surrounds Isaac with a laser on every swing. Enemy projectiles are deflected by both normal and charged attacks.
• Technology 2: Laser fires when the sword is being swung or charged.
• Trisagion: The fired projectile is a Trisagion blast.

Interactions

• Anti-Gravity: Sword beams are affected normally by Anti-Gravity. Regular sword swipes are overridden, but spin attacks freeze for a short time before firing.
• Blood Clot/ Chemical Peel: Sword swing has a 50% chance to become red and deal increased damage.
• Brimstone: Overridden by Spirit Sword.
• Chocolate Milk: Increased knockback when fully charged, no effect on the regular sword swings.
• Cursed Eye: Overridden by Spirit Sword.
• Death's Touch: Visual effect overridden by Spirit Sword including the ranged attack.
• Diplopia: No effect.
• Dr. Fetus: Overridden by Spirit Sword.
• Epic Fetus: Overridden by Spirit Sword.
• Explosivo: The sword swing has a chance to stick Explosivo shots to enemies it hits. The beam can stick to enemies and explode.
• Eye of the Occult: The projectile can be controlled.
• Fire Mind: Sword strikes and beams can burn enemies, and beams have a chance to explode.
• (The Forgotten) The Forgotten: Spirit Sword will only work with The Soul, no changes to The Forgotten.
• Godhead: The fired projectile receives Godhead effects. No effect on the swing aside from stat changes.
• Incubus: Incubus tears are replaced with a sword, identical to Isaac.
• Ipecac: Sword beams are exploding shots that deal Isaac's damage — does not apply Ipecac's +40 damage modifier.
  • Caution should be taken as having full red heart containers (or no red heart containers) will cause a sword beam to always fire when using the regular swing which means any swing (or any spin regardless of red heart containers) will damage Isaac when using the sword at melee range unless he has explosion immunity.
• Jacob's Ladder: Both the sword shots and sword swing create electricity.
• (Jacob and Esau) Jacob and Esau: Knockback from the sword will separate the brother carrying the sword from the other.
• Kidney Stone: Overridden by Spirit Sword.
• The Ludovico Technique: Overridden by Spirit Sword. Prevents the standard swing from being able to fire a projectile.
• Marked: Overridden by Spirit Sword. Stats upgrade still applies.
• Monstro's Lung: Overridden by Spirit Sword.
• Mysterious Liquid: The charged sword attack spawns creep, the projectiles do not.
• Playdough Cookie: Every sword swing gains a different color and effect based on that color.
• Pupula Duplex: No effect.
• Sinus Infection: The sword swing has a chance to stick boogers to enemies it hits. The beam can stick to enemies.
• Sulfur: Overridden by Spirit Sword. Damage up on third and subsequent uses still applies.
• (Tainted Forgotten) Tainted Forgotten: No effect.
• Tractor Beam: Overridden by Spirit Sword.
• Tech.5: Prevents Spirit Sword projectiles from being fired on standard swings. Charged swings still fire projectiles.
• Tech X: Overridden by Spirit Sword.
• Technology Zero: Sword shots are connected with electricity, swings are unaffected.
• Terra/ Sulfuric Acid: Only the sword's beams can destroy rocks.