If any two effects are happening simultaneously, and the rules don’t tell you which order to apply them in, the player (or GM) controlling the effects can do so in any order. For example, if one ability lets you spend a Hope to retaliate after an attack, and another ability lets you gain a Hope when you mark a Hit Point, you can decide to gain the Hope first, then spend it on the attack. Similarly, if you have multiple moves that can trigger in a situation (like two moves that occur “after a successful attack”), you can use them together, and choose which order to use them in. As always, if there’s any uncertainty, the GM arbitrates how effects apply.

At the GM’s discretion, most effects can stack; for example, if two Bards each give you a Rally die, you can spend both of them on the same roll if you wish. However, you can’t stack conditions (see “Conditions”), advantage/disadvantage (see “Advantage and Disadvantage”), or other effects that say you can’t (such as Tava’s Armor from the Book of Ava card).