To get extra elfstone, weapons, or items fight through one player and
when you save after a certain checkpoint(like getting in to Moria) will
unlock a chapter for evil mode by going to more. Play as the enemys and
you have to fight the enemies you were fighting with before ( most of
them) and once you beat all of them you get items, elfstone, or
weapons.(You also can go back to areas before by traveling after you've
beaten a chapter.)