What talents are optional?

Any Talent with the word may is optional and the controlling player can choose if they want to apply the effect. Talents and game effects that do not have the word may are considered to be always Active and the player cannot choose to not apply the effect. If a Talent or game effect says must, then the player is required to follow that text even if a may ability would contradict it. For example, the Brawnen Starting Hero Awsh has the Talent Hunter which says when Attacking a Landmark, this Unit deals +1 Damage. Awsh is considered to always have Hunter Active, so the Brawnen player cannot choose to do less Damage. The Architect Minion has the Builder Talent, which says before or after this Unit's Movement, you may choose one of the following at no cost. The Architect has may in the Talent's text, which means that it is allowed to choose if and when the Talent is used. The Traxxyr Loner Landmark has the Talent Engage which says Units able to Attack this Landmark must do so. Heroes like Awsh normally may Attack, but because the Engage Talent says that Units must Attack it, if Awsh is able to Attack it during the Attack step of the Brawnen's Turn the player does not have an option.