How does the EXP work?

[tomnash]

how does the exp work because the first time i beat leukon knight i got 45 exp and the second time i got 15 so how does it work

[Dark Knight]

if your lvl had gone up the first time you faced leukon knight and you are a new lvl then you will not get as much exp as you did before

[Shadamoo]

The higher level, the less EXP.

And with bosses, you dont get as much EXP on other times fighting them.