Strike

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Abilities with the Strike keyword (often referred to simply as "strikes") deal damage to or impose a harmful effect on specific creatures or objects.

It's Not All Strikes!

The Strike keyword and phrases such as "makes a strike" are reserved for abilities that have a creature targeting specific creatures or objects (not affecting creatures or objects in an area) and harming those targets in some way by making a power roll. The many abilities in the game that target areas of effect are not strikes. They instead use the Area keyword. That means if a feature distinctly interacts with a strike, that feature has no effect on abilities with the Area keyword.

Source: Draw Steel: Heroes · printing 1.01b