Found Soul

Found Soul is a trinket added in The Binding of Isaac: Repentance.

Effects

 * Summons a Familiar that follows Isaac's exact movements, akin to, and shoots spectral tears.
 * The ghost uses Isaac's tears, range, shot speed, tear effects, and trinkets, and deals 0.5x Isaac's damage.
 * The familiar has collision and can be separated. Holding down the "drop" button keeps the familiar in place.
 * When Isaac places a bomb, the familiar will drop one as well.
 * The familiar can press Buttons.
 * The familiar dies after taking any damage, and will respawn on the next floor.

Synergies

 * Found Soul is capable of attaining a copy of its own of each item granting creep, an aura, a special ability or other/miscellaneous, and these items are, but not limited to:
 * : A trail of tears is created behind the soul, identical in function as Isaac's.
 * /: The soul will leave creep of its own.
 * : The soul can create its own circle, identical in function and damage as Isaac's.
 * : The soul receives its own shield in every boss room.
 * The soul receives its own circle, which is the same size as the one given to Isaac.
 * The soul receives its own petrifying ring.
 * While firing, the soul will create its own poison aura.
 * Double tapping will create a shield for the soul as well.
 * The soul receives its own shield, working separate from Isaac's.
 * /: The soul will fart in tandem with Isaac.
 * Lil Clot: The soul receives its own floating Lil Clot that acts the same way as Isaac's, vanishing when the soul dies.
 * Locust of Conquest / Locust of Death / Locust of Famine / Locust of Pestilence / Locust of War: Will spawn an additional locust for Found Soul.
 * Lucky Sack: An extra sack will spawn next to Found Soul.
 * The soul will charge in tandem with Isaac.
 * The soul receives its own damaging ring, scaling with its damage.
 * The soul receives its own damaging aura, identical to Isaac's.
 * The soul will charge up diarrhea in tandem with Isaac.
 * The soul will have its own cone of light.
 * Spawns an additional red crack while the soul is alive.
 * The soul receives its own chargeable beam, scaling with its damage.
 * An identical aura surrounds the soul. The size of it scales with how much Isaac has taken damage on the floor.
 * The soul will spawn a ring of tears each room.
 * The soul will carry a spear of its own.
 * The soul will be creating its own ring of flies.
 * The soul will slowly turn invincible at the same time with Isaac.
 * The soul will be invincible and deal contact damage in the frames Tooth and Nail is active.
 * The soul will carry a shield of its own.

Active Item Interactions

 * In addition to copying/doubling many passive items, Found Soul can utilize the same active item as Isaac, effectively doubling its power/productivity, be it for Isaac's benefit, or itself. Items that are affected by Isaac's damage will scale with Found Soul's damage instead. Many of these are attack-oriented items, and are, but not limited to:

Special Interactions

 * : Will kill the soul at any point during the charge.
 * : The soul will use Dark Arts along with Isaac. Enemies can be marked by both Isaac and the soul. It will gain its own damage boost.
 * : The soul will double only the active effects that it can double.
 * : Allows the soul to activate items that would otherwise be useless, such as, , etc. It can also be used to dodge damage.
 * : Regardless of current charges, the soul will always pay out with a poop on every use of the jar.
 * : The damage is only applied from the soul's part, meaning you will always deal less damage while the soul is carried around.
 * : The soul can indeed pick up rocks and throw them, despite lacking sprite work.
 * : With proper placement, the soul can open another red room, for free.
 * : The soul will throw its own key in tandem with Isaac. The throw still costs one key.
 * : The soul will spew its own blood fountain, but no extra head will spawn.
 * : An extra Peeper familiar is not spawned; however, the soul will benefit from the right eye damage boost.

Other Interactions

 * : Electric zaps will scale with Isaac's damage, instead of the soul's.
 * : The soul will be invincible to contact damage at high speeds.
 * Baby-Bender: No homing on the soul.
 * : Will not double any active used by the soul.
 * : Damage multiplier is independent of Isaac's. Only hits by the soul will count.
 * : Coin tears fired still substract coins.
 * : Invincibility is independent of player movement.
 * : No head orbital is granted to the soul. Other stats still apply.
 * : The soul itself can never trigger IBS, however when the player receives a poop, so does the soul.
 * The soul has its own shot counter, independent of Isaac's.
 * /: The soul is capable of crushing rocks and debris.
 * : The soul gets its own crosshair.
 * Ring Cap: The soul will drop two bombs as well.
 * : Does work. The soul will be chained next to the spot it got hit. Proceeding to not get hit again for a short time will revive the soul as normal.
 * Super Magnet: The soul will have its own attraction field. No effect on pickups.
 * Torn Card: The soul has its own shot counter, independent of Isaac's. Ipecac shots fired by the soul will reflect on itself, rather than Isaac.
 * : No effect.
 * : The soul does not receive a beam, nor are any of its tears affected by Isaac's beam.
 * : Will always be active on the soul.
 * Wooden Cross: Both Isaac and the soul will receive a temporary shield; however, when one of them loses it, so does the other.

Trivia

 * This trinket is a reference to.