Encounters

Encounters can happen under two circumstances :
 * The active hero didn't discover a new tile during the exploration phase
 * The active hero discover a challenging tile during the exploration phase

An encounter is generally an negative effect for the heroes, but sometimes it can be a positive effect or it can have no effect at all. Negative effects encounter can be cancel by power (like Birdsong Dispel Magic power) or with Adrenaline Use.