Assault (X)
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When a creature with the assault (X) keyword is used to fight, it deals pending damage equal to its assault value (X) to the creature it is fighting before the fight resolves. (The active player chooses whether this occurs before or after other “Before Fight” effects and keywords.) If this damage destroys the other creature, the rest of the fight does not occur.
If a creature with the assault (X) keyword gains another instance of the assault (X) keyword, the two X values are added together.
—KeyForge Master Rulebook v17.4 September 2024
Commentary
If a creature with the Assault keyword attacks a creature who has the Hazardous keyword, the active player chooses which keyword resolves first. If the creature is destroyed by the Hazardous effect before the active player resolves the Assault keyword, the Assault is not applied. Similarly, if the creature is destroyed by the Assault keyword before the active player resolves Hazardous, the Hazardous is not applied. This is because the rules for Ability disallow either ability resolving on a card that is not in play.