Publication:Grim-N-Gritty/Combat Modifiers

Combat Modifiers
Because the GnG combat system uses a Defense mechanic, rather than AC, there are some slight changes to the combat modifier rules. Because combat relies on Relative Degree of attack rolls, the coup de grace rules are different.

Favorable and Unfavorable Conditions
For the most part, use the default favorable and unfavorable conditions table, though the bonus/penalty goes to Defense rather than Protection.

Helpless Defenders
In the GnG combat system, helpless defenders automatically roll a “1” on the d20 for their Defense roll, and they lose all Dexterity, dodge, class, and similar bonuses to Defense. As a full-round action, you can use a melee weapon to deliver a coup de grace to a helpless foe. You can also use a ranged weapon, provided you are adjacent to the target. Your attack automatically hits with a Relative Degree of 20.
 * Coup de Grace

Delivering a coup de grace provokes attacks of opportunity from threatening foes because it involves focused concentration and methodical action.