I meant 6 secret room cards.
I agree with many in here.
The travel cards itself are not that important to the game as the base game already comes with 10 travel cards and because of the way the travel cards are used I don't think you probably ever run out of those. The different combinations that you use them is just so vast.
But more travel cards are still pretty much better than less and there is one travel card in LotW that uses the Burning condition which is not used anywhere else.
it is in no way necessary for the enjoyment of the game. I would argue that the travel cards are probably the least enjoymentally aspect of the game in general.
There should only be 3 travel cards in that expansion.