The grid contains 6 special squares where the across and down answers conflict with each other. Each of these squares contains 3 letters from each of the intersecting answers. Taking the letters from the across answer first and the down answer second, the two 3-letter segments can be connected with OR to make an 8-letter word (e.g. FLU OR INE). This mechanic is clued by 12-Down, since "or" is the French word for gold, and also makes sense because the box can be filled in with FLU or INE.
This yields six 8-letter words: ASSORTED, COWORKER, EMPORIUM, FLUORINE, IGNORANT, and LICORICE. Each word starts with one of the 6 letters that appears in the acrostic at the bottom. The acrostic can be filled in by indexing into the word that starts with the given letter (e.g. F2 would be the second letter of FLUORINE, L).
Filling in the acrostic gives the across clue "Link's princess" and the down clue "Painter Dali". These can be used to fill in the word cross with Z[ELD]A and SALV[ADO]R. Repeating the mechanic from above, adding an OR in the special square yields the answer, ELDORADO.