"This is how accurate a unit is, either with missiles or with magic." – manual description

Precision is an offensive martial talent, particularly for ranged attacks. When a javelin is thrown, when an arrow is loosed, and when a spell is cast, the caster's Precision determines where the missile or magic ends up.

Once the square is chosen, Precision's work is done, and the DRN roll is entirely a matter of the fellows in the square. The number of Size points in the square, divided by 2 and rounded down, is added to the Attack roll. The target in the square is chosen at random, with each square occupant having a weight equal to their Size. The decided defender's Defence Skill is not used in the Defence roll, and every 20 points of Fatigue subtracts 1 from their result. Defenders do get to Parry missiles with their Shields, however; in fact, their Parry bonus is doubled.

Magic ranged weapons have +2 to hit, in their Attack roll.

Precision strongly contributes to Patrol Strength. A unit's Patrol Strength is their Precision, plus their Map Movement (or 30 if they're Flying), all divided by 20. A commander's Patrol Strength is then doubled, and an Undisciplined or Mindless unit/commander's Patrol Strength is then halved. In this case, points above 10 are not effectively doubled.

Direct Precision bonuses include an Air Bless, a +4 Precision "buff" from the Eagle Eye line or the Trueshot line, and the +2 Precision "buff" from the Wind Guide spell. Wind Guide also halves any and all Precision "debuffs" placed upon those affected.

Darkness is a somewhat common Precision-reducer. Fighting at night or in other dark places (such as Caves or Deep Seas) results in -3 Attack Skill, -3 Defence Skill, and -3 Precision. The Darkness spell can increase these penalties to -6, though without stacking. There are Global Enchantments that apply 1 or 6 Darkness to everywhere that isn't a Deep Sea or a Cave, and Twilight applies a -2 penalty directly to Precision if no "real" Darkness is present.

Various traits interact with the Precision-reducing effects, however. Darkvision offers a percent reduction of the magnitude of the penalties, generally 50% (though some have 100%). Spirit Sight is 100% Darkvision with added benefits, while True Sight lets one see straight during Twilight. Last-but-not-least, none of these penalties stack with the -9 penalty from Blindness, and those used to being Blind are unaffected by even that.

• On the last note, missing eyes but still being able to see results in -3 Precision per lost eye; this does stack with the Darkness penalties and such, but the summed effects cannot be more severe than blindness.