[...]

Dark Path
Types: Action - Curse - Traveller
cost : $0
-2 VP
+1 Action
When you discard this from play, you may exchange it for a jungle.
Jungle
Types: Treasure - Traveller
cost: $3*
-2 VP
$3
When you discard this from play, you
may exchange it for a Crossroad.
(This is not in the Supply.)
Crossroad
Types: Treasure - Traveller
cost: 4*
-3 VP
$4
+1 Buy
When you discard this from play, you
may exchange it for a Loophole.
(This is not in the Supply.)
Loophole
Types: Treasure - Traveller
cost $5*
-4 VP
$5
When you discard this from play, you
may exchange it for a Breath.
(This is not in the Supply.)
Breath
Types: Treasure - Victory
cost: 6*
2 VP
$6
Trash this.
(This is not in the supply)
This is a super cool idea but i've got a couple reservations about it -
thanks - Before i answer: i am a non native speaker, so maybe i misunderstand some comments; so be patient.
- Should it really jump to gold right away? Especially with Dark Path being non-terminal, all you've really got to do is not dead draw it from a smithy or something to be able to get a Jungle, which is an upgrade in every way; You may want to consider having them be $2 -> $2 +1 Buy -> $3 -> $4
Trash this Return this to the supply, which would make them a little more even-keeled (ie, if you wanted to play with the biggest money, you wouldn't just buy curses right away)
the original Dark Path was a Treasure-Traveller-card with [cost $2, $2 -1VP], means a terminal card. So perhaps it is too provocative to give nothing only change to jungle?
The idea of this traveller line is humans gear to money

.
So the goal is to go the whole line from Dark Path to Breath. It is interesting that at the end you can decide wether you want the $6 and loose +2VP or you want only +2 VP.
The main thing is, that you ignore the -x VP-line in middle game and hope at the end to change from loophole to breath.
I have tested some games with it and it is not simple to win, because the longer the game lasts the improbable is, to get one of the traveller.
- How many of each card should there be in a two, three, ... , six player game?
As it is a normal traveller line there are always 10 cards of Dark Path and 5 for each other.
- You've got a naming conflict (Crossroads exists) and a typo in the card for Crossroad (on its exchange line) - if you need a new forest-y name, maybe "Thicket" or "Copse"?
thanks -yes i remembered something, but i used the wrong search („crossroad” instead of „crossroads”). I will think about a new name.
In german i call it „Scheideweg”, originally it was „decision”. „Branch” would be an alternative.
- Likewise, i think there's a translation issue with "Loophole" and "Breath" - the physical phenomenon of a loophole as opposed to the conceptual phenomenon, which is usually for legal/rules-related things is a man-made thing (like an arrow slit in a tower) rather than something that exists in a forest; I'd suggest "Grove" and "Glade", respectively for what I think you're getting at with those.
The idea of naming is meant more figuratively. So the picture of a real forest way is only a picture but the sense is like in star wars

(way to the dark side of the force).
Thanks for clarifying and questions. Creating such a path is provocative but worth to try.