EffectDamageImmunityDecrease(int, int)

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Create a Damage Immunity Decrease effect.

effect EffectDamageImmunityDecrease(
    int nDamageType,
    int nPercentImmunity
);

Parameters

nDamageType
DAMAGE_TYPE_* to decrease immunity to
nPercentImmunity
The percent amount to lower the targets immunity by. 0 - 100.

Description

Returns a new effect object that when applied to a target will lower the amount of immunity the target has against damage when it is done to them by a certain type defined in the DAMAGE_TYPE constants group.

This effect means if we have 50% damage immunity decrease to fire, we take 50% more damage from any fire damage - so 50 damage would become 75.

The target this effect is applied to must be a creature for it to work. This effect should not be applied instantly, only temporarily or permanently.

Remarks

This will increase damage done to the target if it had no immunity to start with - noting that all increases and decreases of immunity to damage will stack (on hides, items, from effects or whaever) and the maximum is going to be 100% vulnerability (decrease immunity, double damage) or 100% immunity (increased immunity, no damage).

Effect functions are Constructors, which are special methods that help construct effect "objects". You can declare and link effects, and apply them using an ApplyEffectToObject() Command. Once applied, each effect can be got separately via looping valid effects on the target (GetFirst/NextEffect()). See the Effect tutorial for more details.

Effect Breakdown

Damage immunity increases from EffectDamageImmunityIncrease are added up and the decreases from EffectDamageImmunityDecrease are taken off, to get a final "Immunity amount".

However there is an oddity here; it only checks for the current immunity value at the time. For instance these are the results of applying effects in order:

  • No effects - normal damage will apply
  • EffectDamageImmunityIncrease(DAMAGE_TYPE_MAGICAL, 100) - 0 damage will apply
  • EffectDamageImmunityIncrease(DAMAGE_TYPE_MAGICAL, 100) - 0 damage will apply
  • EffectDamageImmunityDecrease(DAMAGE_TYPE_MAGICAL, 100) - Normal damage will apply

Note how the increases (adding up to 200%) do not properly get calculated before the decrease (-100%) is applied. Very strange - usually Bioware checks for existing effects to summarise the amount of something, eg; AC, not just alter the pre-set value.

This is capped at +100% immunity and down to a minimum of -100% vulnerability. Example effects:

  • +100% - Totally immune to all damage of that type, eg 10 damage becomes 0 damage
  • 50% - Takes 50% of the damage dealt by that type off the total amount, eg: 10 damage becomes 5 damage
  • -50% - Adds 50% more on, so 10 damage becomes 15 damage
  • -100% - Adds 100% more on, so 10 damage becomes 20 damage

Still need to investigate the interaction with EffectDamageReduction and EffectDamageResistance, ie which happens first.

nIndex Parameter Value Description and Notes
GetEffectInteger
0 nDamageType - DAMAGE_TYPE_* constants group. Damage the immunity decrease is for.
1 nPercentImmunity Percentage of immunity from this effect.

Known Bugs

As per the above example you can get instances of the wrong immunity percent being applied when already at a the cap, either -100 or +100, when a new immunity increase or decrease is applied.

Version

1.62

Example

// Sample code for applying 50% vulnerability to fire to a target
// (or, in other words, a 50% decrease to any immunity it has).
 
void main()
{
    // This is the Object to apply the effect to.
    object oTarget = OBJECT_SELF;
 
    // Create the effect to apply
    effect eDamageImmunityDecrease = EffectDamageImmunityDecrease(DAMAGE_TYPE_FIRE, 50);
 
    // Create the visual portion of the effect. This is instantly
    // applied and not persistent with whether or not we have the
    // above effect.
    effect eVis = EffectVisualEffect(VFX_IMP_REDUCE_ABILITY_SCORE);
 
    // Apply the visual effect to the target
    ApplyEffectToObject(DURATION_TYPE_INSTANT, eVis, oTarget);
    // Apply the effect to the object   
    ApplyEffectToObject(DURATION_TYPE_PERMANENT, eDamageImmunityDecrease, oTarget);
}

See Also

functions: 

EffectDamageImmunityIncrease

constants: 

DAMAGE_TYPE_* Constants


 author: John Shuell, editor: Jasperre, additional contributor(s): Jasperre