See also: Character Combat
Attacking is a Standard Action. When you make an attack roll, roll 1d20 and add the appropriate modifiers. If your result is equal to or higher than the target's Reflex Defense, you hit and deal Damage.
Your attack roll with a melee weapon or unarmed attack is:
1d20 + Base Attack Bonus + Strength Modifier
Your attack roll with a ranged weapon is:
Base Attack Bonus: Your Heroic Class and level determine your Base Attack Bonus.
Range Penalty: A ranged weapon can attack a target at Point-Blank, Short, Medium, or Long Range. If you make a ranged attack against a target within the weapon's Point-Blank Range, you take no penalty on the attack roll; your penalty on attack rolls increases to -2 at Short Range, -5 at Medium Range, and -10 at Long Range.
When you roll a natural 20 on your attack roll (The d20 comes up "20"), the attack automatically hits, no matter how high the defender's Reflex Defense. In addition, you score a Critical Hit and deal double damage. All targets are subject to Critical Hits, even inanimate objects.
When you roll a natural 1 on your attack roll (The d20 comes up "1"), the attack automatically misses, no matter how high the bonus on the attack roll is. Effects that negate an attack (Such as Block, Deflect, or Vehicular Combat) or cause an attack to automatically miss (Such as spending a Destiny Point) can also negate a Critical Hit.