Monster bonus abilities can come from their ability cards or their statistic sheet.
Ability card bonuses are activated through actions only when the monster activates and are only active until the end of the round in which the card was drawn.
Example: This bonus lets the Archer target 2 different targets when attacking.
Example: This bonus places a strengthen condition on the Guard. Which will be used for their next attack to give them Advantage.
Monster statistic card bonus are active every time that monster activates.
In this example, whenever the monster activates and attacks a character, it will target 3 characters. Also whenever it is attack it will reduce the attack by 1 since it has a shield 1.
In this example whenever the enemy activates and attacks a character it will poison the attacked character.