A Missing Page is a trinket in The Binding of Isaac.

Adds +40 damage to The Necronomicon and similar effects, such as Black Hearts.

Grants a 5% luck-based chance to activate The Necronomicon upon taking damage. The chance goes up to 50% with very high luck (50-65).

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this trinket for the previous Repentance version, check this page instead.

This item contributes towards the Necromancer transformation. Collecting all 3 items and trinkets from this set will upgrade The Necronomicon and give Isaac a 5% chance to deal 120 damage when taking damage.

A Missing Page can be found in the following item pools:

The following special synergies and interactions for A Missing Page have been documented.

* Note that not all possible synergies and interactions are listed here.

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

A Missing Page

• (without Mom's Box & without Missing Page 2): 5% chance to deal 80 damage to the room when taking damage
• Golden Trinket (without Mom's Box & without Missing Page 2): 5% chance to deal 120 damage to the room when taking damage
• Mom's Box: 5% chance to deal 120 damage to the room when taking damage
• Mom's Box + Golden Trinket: 5% chance to deal 160 damage to the room when taking damage
• Missing Page 2 (without Mom's Box): 5% chance to deal 120 damage to the room when taking damage
• Missing Page 2 + Golden Trinket (without Mom's Box): 5% chance to deal 160 damage to the room when taking damage
• Mom's Box + Missing Page 2: 5% chance to deal 160 damage to the room when taking damage
• Mom's Box + Missing Page 2 + Golden Trinket: 5% chance to deal 200 damage to the room when taking damage
• Necronomicon, black hearts, and Dry Baby also do this increased damage

• Check out the trinket description on the external Isaac Wiki.