Post: #10

The formula is taken from the source, https://github.com/Sphereserver/Source/b....cpp#L122, check case 1

In case of combat and if understand it well, actdiff is the threshold number that is compared to a "random roll" made by Sphere after/in the @Start trigger.

If the random roll (from to 0 to 999) is more or equal than actdiff, then the action is succesfull (pay attention that while you can change the actdiff value by script, you don't have access to the random roll value made by Sphere).

So in the @Start trigger:

actdiff= 0 always success
actdiff >= 1000 always fail.

In the @HitTry trigger the result is already calculated and Sphere already know if the hit will be a miss or a success.
If it's a fail, the actdiff value will be negative.
If it's a success the actdiff value will remain positive.
Example:
We set actdiff in @Start with a value of 10 (very easy)
In the @HitTry we log the actdiff and we see that actdiff is -10, that means we actually miss the target.


Summary:
Increasing the actdiff value in the @Start trigger of a skill will actually make the action more difficult.
Increasing the actdiff value in the @HitTry trigger does nothing (unless you change it to a positive number from a negative number)

Anyway you can make your own formula in @HitTry for overriding the results, also in the @HitMiss trigger if you change the actdiff value to a positive number it will still trigger a succesfull hit!