Can someone explain to me how p/m def addded up?

OPKossy wrote: »

The gap between +11 and +12 is rather noticable.

That aside, gear defense works like weapon attack. An item with pdef +100, for example, is going to give you a good bit over 100 pdef in reality. Much like how weapon attack has its own multipliers before you see what goes on your character menu.

The exact formula should be on the wiki somewhere but at the moment I can't go check for it.

Resistance

Physical Resistance is based on your Str, Vit, and equipment defense (the sum of the Physical Defense found on all of your equipment). Similarly Magical Resistances are based on your Mag, Vit, and equipment Magical Resistances. Magical Resistances should be calculated separately for each of the 5 magical elements, but most equipment has the same resistance across all the elements.
physical defense = Round{ ( Vit + Str - 2 ) / 4 } + Round{ Def * ( 1 + Round{ ( ( 2 * Vit ) + ( 3 * Str ) ) / 25 } / 100 ) } + 1
magic resistance = Round{ ( Vit + Mag - 2 ) / 4 } + Round{ Res * ( 1 + Round{ ( ( 2 * Vit ) + ( 3 * Mag ) ) / 25 } / 100 ) }
Defense and resistance work by lowering damage according to the following formula. (Values within "Round{ x }" are rounded to the nearest integer.)
physical reduction% = physical defense / ( ( 40 * attacker level ) + physical defense - 25 )
magical reduction% = magic resistance / ( ( 40 * attacker level ) + magical resistance - 25 )
The reduction is rounded down to two decimal places.
damage delivered = damage dealt * ( 1 - reduction% )
The above reduction percentages are shown in the character sheet when hovering over the stat. If equipment adds a physical damage reduction stat it does not contribute to this reduction%. This is a separate reduction that applies in a different step from the above.
physical damage delivered = damage dealt * ( 1 - defense reduction% ) * ( 1 - total physical damage reduction from equipment% )
Note that in-game statistics menu reductions are shown as truncated numbers (39.7% reduction will be shown as 39% in menu). To receive exact results, you shouldn't omit fractions.