Diplopia

**Diplopia** is an activated item added in *The Binding of Isaac: Afterbirth*.

## Effect

* Duplicates all pickups and pedestal items in the current room, then disappears.

## Notes

* If used in a Shop, the duplicated pickups and items can be taken for free.
* If used in a Devil Room or the Black Market, the duplicated items can be taken for free. The original items will still be offered at an HP price, and Deal with the Devil precedent will not be obtained.
* If an item pedestal that is duplicated is visible as "?" (for example with the Curse of the Blind), duplicate will be visible as "?" until taken, just like the original item pedestal.
* Using Diplopia on another copy of Diplopia will not work.
* Using Diplopia on a trinket will spawn another random trinket instead of duplicating the trinket.
	+ Using Diplopia on a trinket does nothing.
* Does not duplicate .
* Using Diplopia on an empty item pedestal will spawn another random item.
* Picking up multiple copies of items that can cause Isaac to transform will not count towards transformation progress.
	+ Multiple copies of the same item do count towards transformations.
* If Diplopia is used in a room that offers a choice between multiple items, all of the duplicated items can be taken. The original items will still behave as normal: once an item is chosen, the others will disappear, but the duplicates will remain. This also includes Boss Rush (**though taking any duplicate will still start the Boss Rush**)
	+ Only one duplicate can be taken. This effects Treasure Room on the alternate path, Angel Room that has multiple item pedestals, the  and  after defeating Mom, the item , Boss Rush, etc.
* Jacob and Esau can use this item to duplicate an active item to each have the same active item.
* Tear-boosting items, if stacked, cap at shooting 16 tears at once.

## Synergies

* : Isaac fires 3 tightly-packed tears with no increase in tear delay.
	+ Damage down does not stack.
* : Spawns a special Diplopia wisp on the middle ring. The wisp fires two tears at a time (similar to ) and have a large amount of health. Using Diplopia also duplicates all of Isaac's other wisps.
* : Isaac fires two lasers simultaneously.
	+ Isaac gains a powered-up version of Brimstone with a unique costume that deals 1.2x damage and has +1 damage. Further copies will add another +1 damage.
* : Triples the drops upon clearing a room.
* : Spawns an extra item for each item cloned.
* : Isaac fires two bombs simultaneously.
* : Tears upgrades stack and Isaac gains two items at the start of the next run. Stacks up to 10 times.
* : Two missiles drop, one after the other.
* : Isaac fires 6 tears. Tears down stat does not stack.
	+ Isaac fires an additional tear. Tears down stat does not stack.
* : A smaller tear orbits the main tear.
* : Increased damage for tears and ring.
* : Isaac fires two knives simultaneously.
* : The tear burst gains another 10 tears/12 tears, nearly doubling in size. Stacks up to 4 times.
* : Isaac fires 8 tears. Tears down stat does not stack.
	+ Isaac fires 2 additional tears. Tear down stat does not stack.
* : An extra soul heart is given for each relic familiar.
* + any active item: While there is no use in duplicating the Schoolbag, it gives Isaac a use for duplicating an active item.
* : All items in Shops become free. With , items can be infinitely bought for free.
	+ Each additional Steam Sale will further halve the price. Items cannot be reduced below 1 cent.
* : Isaac fires two lasers simultaneously.
* : Isaac fires two laser rings simultaneously.
* : Adds two more familiars that float further away from either side of Isaac.
* : Allows infinite uses of Diplopia. This can be done by dropping the card, using Diplopia, then picking up the copied card and using it. This results in everything in the room being copied, including the first wild card. This can be repeated infinitely as long as Diplopia was the last item used.
* : Isaac fires 4 tears diagonally.
	+ Isaac fires 3 tears, one straight ahead and two diagonally.

## Interactions

* : Expends both the card and the item with no additional benefit.
	+ Now expends the card without consuming Diplopia, allowing for potential multiple uses.
		- If 2 ? Cards are gathered in the same room, one can be used to duplicate the other, allowing for infinite duplication of everything else in that room.
		- If 3 ? Cards are gathered in the same room, one of them can be used to duplicate infinite ? Cards as well.
* : Range increases twice. No effect on how many bone tears are fired or how many bone shards are fired.
* : Only increases range further.
* : Damage multiplier doesn't stack.
* : Only further decreases shot speed and increases range.
* : The damage multiplier increases twice as fast, but still caps at double damage.
* / : All copies of these items starts with no charge.
* : The damage and tear multipliers do not stack. The shot speed does stack.
* : Only further increases range.
* : Spawns two familiars completely overlapping each other.
* : Only stat ups and downs compound, but the aura gains no bonus.
* : Isaac will have two orbital heads, but only one will fire tears.
* : An extra effect is added in the room it was found in, but only a single effect will be given in future rooms.
* : Increases damage but not chance of concussive tears being fired.
* , : Spawns a copy of the same Key Piece. The copy does not increase the chance for an Angel Room.
* : Only further decreases speed.
* /  /  / : Does not allow more than two pills or cards to be held at once.
* : Only further decreases shot speed.
* : Increases all stats twice, but damage significantly less the second time as the 1.5x multipliers do not stack.
* : Only increases range and firerate.
* : Only increases range.
* / : Does not allow more than two trinkets to be held at once.
* : Only increases range.
* : Only grants 3 more coins. Does not drop more pennies when taking damage.
* : Only increases HP with no change to the regeneration effect.
* : Spawns two familiars that completely overlap each other.
* : No effect. Aura changes after a second pickup.
* : Increases maximum familiar count by 5.
* : Only adds soul hearts with no addition effect on the beam.
* : Further decreases tears and shot speed with no increase in damage.
* : Further increases speed with no further effect on movement speed or shot speed of enemies.
* : Only further increases damage.
* : Further increases shot speed, fire rate, and range with no other effects.

## Trivia

* This is the first Afterbirth item by ID number.
* Diplopia is the simultaneous perception of two images of a single object, commonly referred to as double vision.
* This item's icon is similar to .