What rule system does Diablo III use?

Question

I am really interested in the actual calculations behind damage, how stats increase, avoidance calculations (e.g., miss chance, dodge, etc.), and so on.

How are these calculated? Is Diablo based on a role-playing system (such as GURP) whose calculations are publicly available?

Asked by Zainodis

Answer

There is no comprehensive list of rules yet, but the fine folks at MMO Mechanics have spaded a list of formulas to start off.

Player Life

Life when player level < 35 = 36 + 4 × Level + 10 × Vitality

Life when player level ≥ 35 = (level - 25) × Vitality

Damage

Damage on Character Sheet = (1 + passive skill boosts)*(Weapon DPS + ((minimum damage bonus + maximum damage bonus)/2)Attack Speed)(Weapon Damage Multipliers)(Attack Speed / Weapon Speed)(1 + ( crit% * crit damage %))*( 1 + (main stat / 100))

Spell Damage Modifier = (1 + passive skill boosts)(Weapon Damage + (minimum damage bonus + maximum damage bonus) / 2)(1 + (main stat / 100))

Defense

Total damage reduction = 1 - ((1 - DR from Armor) × (1 - DR from Resistance) × (1 - other DR))

Physical damage reduction = Armor / (50 × Monster Level + Armor)

Elemental damage reduction = Resistance / (5 × Monster Level + Resistance)

Offense

APS (attacks per second) = base weapon APS × (1 + dual wield bonus + other attack speed bonuses)

Experience

Monster level compared to character level      XP gain
3 levels higher and above                      125%
2 levels higher                                    120%
1 level higher                                     115%
Same level monster                             100%
1 level lower                                       90%
2 levels lower                                      80%
3 levels lower                                      70%
4 levels lower                                      60%
5 levels lower                                      45%
6 levels lower                                      30% (no +XP/kill from gear)
7 levels lower                                      15% (no +XP/kill from gear)
8 levels lower                                       5% (no +XP/kill from gear)
9 levels lower                                       1% (no +XP/kill from gear)

Group Mechanics

Normal

# Players   HP%    Damage %
1           100%    100%
2           175%    100%
3           250%    100%
4           325%    100%

Nightmare

# Players   HP%    Damage %
1           100%    100%
2           185%    105%
3           270%    110%
4           355%    115%

Hell

# Players   HP%    Damage %
1           100%    100%
2           195%    110%
3           290%    120%
4           385%    130%

Inferno

# Players   HP%    Damage %
1           100%    100%
2           210%    115%
3           320%    130%
4           430%    145%

Answered by Mr. November

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