In menu: Advanced / Gameplay constants are a bunch of "Hero XP" entries.
They are used to find out how much experience you get from killing stuff.
And how long it takes to level up.
Nothing excitingly complicated, but it's always good to have some reference around, just in case.
Getting experience from killing enemy Heroes
Hero XP Gained - Hero, Constant factor: 100
Hero XP Gained - Hero, Level factor: 0
Hero XP Gained - Hero, Previous value factor: 1
Hero XP Gained - Hero, Table: 100, 120, 160, 220, 300
If you kill a level 1 Hero, you get 100 experience.
That's the first value in the table.
If you kill a level 2 Hero, you get 120 experience.
The second value in the table.
Until, finally, a level 5 Hero gives 300 experience.
After that, the game runs out of table and uses the other values to continue: