Guild Wars 2

I’m sorry for answering this question even tough there is certainly the answer out there but i still could not find it.

my question is can we make dusk with level 75 rare greatswrods, or 71 exotics ?
and what could be the best and less expensive way to get it ?

You can get dusk by combining lv75+ rare or exotic greatswords in the mystic forge. The best way is to save up for it. There’s a price, you work for it, you put your offer, and you get it. I don’t recommend the mystic forge because you risk your money, effort, time and therefore, your disinterest in the game. Some recommend dedicating 10% of your earnings to the MF and trying out your luck, if you wanna consider that. It’s up to you though how much you value your time.

Meneldil.3607:

what could be the best and less expensive way to get it ?

You buy it off the Trading post.