Crystal Ball
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Crystal Ball is an activated item.
Effects
- Upon use, reveals the floor layout and all special rooms except the
Super Secret Room and 
Ultra Secret Room and drops either a 
Soul Heart or a random card or rune. (50% chance of either) 
While held, increases the chance of finding a 
Planetarium by 15%, or 100% if a treasure room has been skipped.
Notes
- Crystal Ball can be obtained by playing a
Fortune Telling Machine.
- It's possible to get more than one Crystal Ball from Fortune Telling Machines on a single run.
- It's possible to get more than one Crystal Ball from
- The map revealing effect will not work if the
Curse of the Lost is active. - The Planetarium bonus guarantees the level generation to attempt placing one, but the level layout may not have enough room. Read the article on Planetariums for further details.
Synergies
-
Book of Virtues: Wisps have much greater health than normal wisps. Tears that are fired from the wisps will auto aim towards nearby enemies, similar to 
Demon Baby.
Interactions
Daemon's Tail: The chance to drop cards or runes will change to 90%/10% in favor of Soul Heart.
In-game Footage
Unlockable Achievements
Gallery
3DS The icon of Crystal Ball as seen on the lower 3DS screen.
Trivia
- The reflection of a face can be seen on the crystal ball's surface. It is easier to make out on the 3DS lower screen icon.
 The Binding of Isaac: Rebirth
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