can someone tell me how to make a shadow merc? because i want my mage to be one. I saw an archer as one do does it mean u need to have a lot of agility?

Actually, the name changes as you level, depending on stats, level, and skills in the hotbar.

My ranger was a poison mercenary when I used poison skills in my L and R hotbar and my stats were split evenly between agil and intel (since I'm a ranger/mage hybrid). Now, its name is "sulfuric scout", since I replaced one skill with a fire skill in the R hotbar.

It probably becomes "shadow" if you use shadow skills in the hotbar maybe.

With Shadow Lightening on left and Shadow Word: Smackdown on right my ranger is a Shadow Merc. This changes to a Shadow Scout if I add retribution on my bar instead of thickheadedness.