These feats now work with all attacks and attack actions. The activation of a spell, power, or maneuver in which you make a attack does not qualify for the additional damage from these feats. The extra damage from this feat can only be applied once per round, and must be declared before making the attack roll. With the Improved and Greater versions of Vital Strike, you can decrease the number of additional dice of damage and disburse it among the other attacks in the round. For example, a Level 16 fighter with four iterative attacks and the complete Vital Strike feat chain can take a full attack and for his first attack use all three feats worth of damage, doing (assuming a longsword) 4d8+Modifiers points of damage with the first attack and then normal damage with all subsequent attacks. Alternatively, he could add a single extra weapon’s worth of damage to the first three attacks, allowing each of them to deal 2d8+Modifiers points of damage with the first three attacks, and then normal damage for the 4th iterative attack.