Prevent appears in statements that define an amount of damage and the source of the damage it will affect, as well as the timespan it will be relevant for. 1. Prevent actions are usually formatted as “Prevent the next X [source] damage that would be dealt to a [unit] this turn.” 1.a. The X is referred to as the Prevent Value. 1.b. X can be “All,” which specifies an infinite amount of damage. 2. Prevent will always apply to the next damage that would be dealt to a unit affected by the Prevent action.
§ 437.1.b Core Rules PDF (officieel)
§ 437 Prevent
§ 437.1 Preventing damage is the act of reducing the Damage a set of game objects would take.
