neutral hostile experience

ok what stats decides how many experience a unit gives?

the level of it, Dont know how much every level gives though..

Gameplay constants has a factor attached to the level of the killed unit.

ok which would that be :) im no hero with the constants but my map has lvl 15 boss hero's (I'd like them to give more exp than the regular lvl 20+ units I have)

Well, you could custom trigger the XP. Give the heroes a defined amount of XP after killing him, slay a unit of higher level after killing him (make sure they slay it).

Or simply just make him higher level -.-