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Crystal Ball item
Crystal Ball is an active item in The Binding of Isaac.
Description
While held +15% Planetarium chance, or +100% if at least one Treasure Room has been skipped.
Even though it grants a 100% planetarium chance, it still cannot guarantee one to spawn due to some floor layouts not being capable of spawning one.
On useReveals the floor layout and all map icons except the Super Secret Room.
50/50 chance to drop either a 
Soul Heart or a random card/rune.
Can drop as a final payout from a 
Fortune Telling Machine.
Note
This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.
Item pools
Crystal Ball can be found in the following item pools:
| Name | Weight |
|---|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| offensive | Can appear for  Tainted Lost. |
| stars | Contributes towards unlocking Planetariums. |
| lazarussharedglobal | Passive effects (except direct stat changes) are shared between  Tainted Lazarus' forms. |
Special synergies
The following special synergies and interactions for Crystal Ball have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Book of Virtues | Wisps have much higher health than normal. Their tears will automatically aim towards nearby enemies. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the external Isaac Wiki.
The Peeper 
Habit 
Bloody Lust 
Spirit of the Night 
Crack the Sky 
Ankh