Experience for Creeps and Enemies

[Garrett]

Does anyone know how the Experience gained from Creeps, Heroes, and normal enemy units works? Theres some table of integers in the gameplay constants, but I'm not sure exactly how it works?

 

[Darg]

The four fields being examined are:

Hero XP Gained - Hero, Constant Factor
Hero, Level Factor
Hero, Previous Value Factor
Hero, Table

and from the mouths of the gods (or blizzard as some call them):

Experience Tables 101
---------------------

The overall purpose of these four fields is to define a value of experience for every possible level. The "Table" field does this by simply specifying exactly that, an experience value for each level.

For example:

Hero XP Gained - Hero, Table = 100,120,160,220,300

which means that a hero will receive 100 XP for killing a level 1 hero, 120 XP for killing a level 2 hero, and so forth.

Now then, explicitly setting a value for every single hero level can be tedious and wasteful if you have a lot of hero levels (say, 500). So, the three formula fields are used to calculate all values beyond those in the existing table field.

This formula computes the experience value "f(x)", for level "x", based on the level and previous experience value, as well as a constant:

f(x) = C + L*x + P*f(x-1)

where

C = Constant Factor field
L = Level Factor field
P = Previous Value field

Continuing our example using the Hero XP Gained - Hero fields (C = 100, L = 0, P = 1), the experience gained from killing a level 6 hero would be:

100 + 0*6 + 1*300 = 400

Note that the 300 is the experience for level 5, which comes from the table. For level 7, we get:

100 + 0*7 + 1*400 = 500

and so on. This particular equation is quite simple, it just adds 100 more for every level.

Now we can look at the Hero XP Gained - Normal fields, where

Table = 25 (only one entry!)
C = 5
L = 5
P = 1

and compute

f(1) = 25 (from table)
f(2) = 5 + 5*2 + 1*25 = 40
f(3) = 5 + 5*3 + 1*40 = 60
f(4) = 5 + 5*4 + 1*60 = 85
f(5) = 5 + 5*5 + 1*85 = 115

and so on.


And if I can add to this, the 'creep reduction table' is a universal value on top of whatever XP the hero gets. So for example, if the hero is at level 1, AFTER you calculate the XP from a creep using the above calculations, you then multiply that by 0.80 to get the total experience gained. This is because the first value in the creep reduction table is 80. So as you can see, by the time the hero gets to level 5, he can no longer earn any XP from creeps, because the level 5 value is zero.

And of course, the above example uses the default numbers for the creep reduction table, you are of course free to modify them as you please