The Polaroid

The Polaroid is an unlockable passive item.

Effects

 * If the character has half a red heart or no red hearts after taking damage, it triggers the effect, creating a shield that nullifies all types of damage for 5 seconds.
 * Allows entrance into after beating Isaac in the  by touching the chest.
 * Opens A Strange Door in II and its variants that leads to / II.
 * Unlike with the Chest entrance, The Polaroid gets consumed by the door and vanishes from Isaac's inventory.

Trivia

 * In the original Binding of Isaac flash game, The Polaroid used to be a trinket that Mom would drop in addition to a regular collectible from the boss pool. When it was originally implemented, it was only available in the normal Trinket drop pool and was implemented secretively. Players were frustrated, so, with an update, Edmund made it so it would also only drop if the player took no red heart damage against Mom, similar to the conditions for the Devil Room to open its path. Since players would not always receive the Polaroid and might switch it out with another trinket, Edmund wanted to make the discovery of (and its at-the-time new ending) something special.
 * As soon as The Polaroid or become available, they will drop in place of the regular Boss Room item Mom would otherwise provide, essentially providing a difficulty increase for  and beyond after either has been unlocked.
 * They can, however, be re-rolled (or converted into stat increases with ) at the cost of closing off access to Chapter 6.

Seeds
NTKG 9MMP (Starting item for Eden)