Merchant Archive

As i was crusing around i notice that merchants have different colors I.E mark's mart instead of being white it was Blue. I figured out the blue but how do u get the other colors. The reason i am asking here is because i was told to. TIA

Yda / Tarquinas / Doctor 4/3/4/4 Merchant /3/3/3/2

Once you start down the dark path, forever it will dominate your Destiny- Yoda