Yes, the ability is a passive that is displayed in the lower right corner, above your active abilities, if I'm not mistaken.
Rebel Guerilla Strike: All allies have +10% Critical Chance and a 25% chance to gain Advantage at the start of each Encounter. In addition, each ally's first successful attack each encounter has a 35% chance to also Daze the target for 2 turns.
So yeah, it's a passive ability buff. Looks like a circle with a lightning bolt hitting it.
Replies
Rebel Guerilla Strike: All allies have +10% Critical Chance and a 25% chance to gain Advantage at the start of each Encounter. In addition, each ally's first successful attack each encounter has a 35% chance to also Daze the target for 2 turns.
So yeah, it's a passive ability buff. Looks like a circle with a lightning bolt hitting it.