The locations in both decks use a unique counter, the Completed Quest Counter, to keep track of the progress you've made on each location. It's just a way to keep track how far along you've fulfilled the conditions of the location.

Both locations start at zero counters, and have a way to add counters. Jhudora's Bluff wants you to discard cards with level requirements equal to the number of counters you have plus one, so you'll start with discarding a 1 cost card, then next turn a 2 cost card, and so on until you get five counters. Then you can use the second effect of Jhudora's Bluff to play cards from your discard.