Crystal Ball
From He is Coming Official Wiki
Crystal Balls 
are an uncommon encounter that the player can use to reveal the location of another encounter nearby, which stays revealed for the rest of the run. The choice is presented in a set of 3, usually between other uncommon encounters, like Golems 
or Travelling Merchants 
. Crystal Balls can contain rare or very rare encounters as well, such as Fairy Queens 
or Beehives 
.
