Enhanced heroes
Alters heroes (and leaders), so that they only need 50% as much XP to gain a new level. This means much faster leveling, max level remains unmodified.
Moreover the heroes get 8 skill points per level instead of 5.
These changes are intended to make the heroes far more significant on the battlefield without touching game balance too much. In theory heroes with more interesting or powerful abilities at high levels become stronger with this mod (Amazon Call of the Wild or Celestian Compelling Presence come to mind).