I simply love dungeons, handled correctly they are better than the Fruit Flavoured God of Awesomeness!
The heroes storm the Temple of R’gu, the God From The Stars, to steal the Ruby of the Winged Master
The Great King long ago ceased attempting to police the wastelands of his Border Marches, and these debatable lands fell into the hands of petty counts, retired generals, and warlords, who constructed and then abandoned many keeps ripe for plunder.
The Repository of the victorious dead…
Believable magic, like ordinary physicis, operates according to some invariable laws that always result in some kind of cost or "bounce back". The grater the magic, the more it should cost the character physically, emotionally, and spiritually.