So I am a stumped as what to do with a dwarf vault I created. My players are keen on getting into it, and several powerful factions also want whats inside. Pretty much all they know is its called "the black vault" in dwarven. Rumored to have magical artifacts within, which was lost when this ancient dwarven empire fell 100 years ago.
So I never got around to actually coming up with what it really is or whats inside. Any ideas or advice would be greatly appreciated to get me out of this little bind and to give something fun for my players to discover.