Calculating Weapon Skill Damage

Magic-Based Weapon Skills

• Damage = ( ((((( Lv+2+WSC ) * fTP + fINT ) * Resist) * Elemental Staves) * Weather) * MDIF ) * Magic Damage Adjustment

Where

WSC: Secondary attribute like STR 30% (30% of your STR) (See individual Weapon Skill)

fTP: TP Multiplier (See individual Weapon Skill)

fINT : function of your INT and target's INT

for WS, fINT = 8 + ΔINT/2

ΔINT : difference between your INT and target’s INT (caps at 24 for WS)

Resist : Possibilities are

No Resist(1/1)

Half Resist(1/2)

Quarter Resist(1/4)

Resisted(1/8 and 1/16)

Void(0)

Weather

if WS is used in single weather effect = 1.1 (+0.1)

if WS is used in double weather effect = 1.25 (+0.25)

Conversely, if WS is being used on the day where WS element is weak to, the multiplier is reduced by 0.1 and 0.25

MDIF : ratio of your Magic ATK to target’s Magic DEF (Matk/Mdef)

Magic Damage Adjustment : (1 + or - (Shells, Shining Ruby, sum of magic damage cut equipment))

This parameter have denominator of 256 (1/256), for example

Shell I is -24/256, Shell II is -36/256, Shell III is -48/256

Shell IV is -56/256, Shining Ruby is -10/256, Bubble Curtain is -128/256

The smallest Magic Damage Adjustment number given by equipment capped the multiplier to 128/256 (0.5)

Certain magic damage adjustments of particular monster family have been found:

Ebony Puddings in Mount Zhayolm appear to take 25% bonus magic damage (+64/256).

Eo'ghrahs in Grand Palace of Hu'Xzoi appear to take 87.5% magic damage (-32/256).

Demon, Ahriman, Corse, Cardian have 25%(-64/256) magic damage cut

Evil Weapon have 12.5%(-32/256) magic damage cut

To some particular HNM, magic damage cut can occur occasionally when using the same element against that of HNM

Physical-Based Weapon Skills

Melee PDIF function

Ranged PDIF function

• Damage = WD * PDIF = (( D + fSTR + WSC) * fTP) * PDIF

Where

WD: Base damage of your Weapon Skill

D: Base damage of your weapon (e.g., Espadon = 43)

fSTR: function of difference between your STR and target's VIT

WSC: Secondary attribute like STR 30% (30% of your STR)

fTP : TP Multiplier (See individual Weapon Skill)

PDIF: function of (your Physical ATK/target’s Physical DEF)

WSC = integer(any secondary attributes) x @

    Level    @
    Lv75... 0.83
    Lv74... 0.83
    Lv73... 0.84
    Lv72... 0.84
    Lv67... 0.86 or 0.87 (perhaps 0.87)
    Lv60... 0.90 or 0.91 (perhaps 0.90)
    Lv40... 0.94 
    Lv37... 0.94 – 0.99
    Lv31... 0.94 - 0.99

• For example, suppose you are level 67 and have 100 STR and 100 MND and you use Swift Blade (STR 30%, MND 30%).
• WSC = integer[(100 x 0.3) + (100 x 0.3)] x @ = integer(60) x @ = 60 x .86

(@ is 0.86 - 0.87 at LV67)

• WD = ( D + fSTR + WSC) * fTP

For Sneak Attack with Thief main, the calculation is WD = ( D + fSTR + WSC) * fTP + DEX

For Trick Attack with Thief main, the calculation is WD = ( D + fSTR + WSC) * fTP + AGI

For Sneak Attack and Trick Attack with Thief main, the calculation is WD = ( D + fSTR + WSC) * fTP + DEX + AGI

• Only weapon skills that say "Chance of critical varies with TP" can have a critical hit within the WS.
  • These weapon skills have your normal critical hit rate at 100% TP, up to +50% higher at 300 TP.

See also

• Weapon Skills
• Allakhazam : Discussion & Source
• FFXI Online : Detailed Discussion.
• VZX FFXI Doc
• Studio Gobli's Memo (Japanese).
• Critical hit rate research