On an overgrown path deep in the forests, you find a crumbling temple. Normally, you would let it pass as there is clearly nothing of value, but on this day you feel a calling deep within you. What lies inside that would so summon you?"
This game will be fairly standard DnD 3.5. There are two key exceptions: the prevalence of homebrew magic items (with a fair number of monsters as well), and the gods of the world are different.