Guild Wars 2

Farm gold and buy it or craft it in mystic forge ?

Fastest way would be to get extremely lucky as a drop, followed by throwing a few rares/exotics in the mf and getting almost as lucky. The only current reliable method is farming gold for it.

However, if you’re willing to wait for the expansion (perhaps farming gold, or throwing a few rares into the mf in the meantime), you will be able to obtain it through collections – we just don’t know exactly how difficult or time-consuming it will be.

Since getting it from the mystic toilet is actually an RNG game, you are only certain to get it when buying it.. Some people get Dusk after some attempts, others are still putting stuff in the toilet since launch, to no avail..

Only guaranteed way is to buy it. Always possible to hit the lucky roll but so many posts over so many years of “I spent thousands of gold and got no pre” that I would just spend the gold if I wanted a specific pre.
Or wait until the HoT release with a way to get a pre of your choice via game mechanics.

The fastest, most reliable way to get Dusk:

Press “O” to open up the BLTC
Navigate to the gem store and select “Buy Gems”
Enter in your credit card information and select how many gems you would like to purchase. (~$160 USD worth to have enough gold to buy it off TP)
After you’ve recieved your gems, navigate to the gem exchange. Convert all your gems to gold.
Navigate to the BLTC, search for “Dusk”. Place buy order, or buy instantly.

Now you are a proud new owner of Dusk!!

Seriously. This is the absolute fastest/best way to get Dusk. Anything else requries you to be extremely lucky, or spend a stupid amount of time farming dungeons and teq to get the gold needed.

Good luck!