Ancestral Knowledge, along with Untroubled by Darkness is really only useful in certain quests with certain decks. Pretty much summed up in my review of that card. You could possibly consider this card if you're running dwarves in a quest with lots of underground or dark locations.
Event. Cost: 1.
Action: Exhaust a Dwarf character to place 2 progress tokens on the active location. (4 progress tokens instead if it is an Underground or Mountain location.)
Khazad-dûm #12. Lore.
It doesnt help with Dark locations (though it should, honestly) — Mad Morderan 99