If I use a lesser vial and vamp dust on a pet, will I have a visible and hidden trait or will I Just have one visible/carried trait since it says a lesser vial is 1 visible trait? I can rewrite it if its too confusing. Thanks! (Edited because I said goo not vamp dust)

Vamp dust will always give you a hidden trait (except on maj pets because they only have one set of traits to work with) and because of that can only be used on pets with blood on them that gives a visible trait to hide behind. You can still get hiddens even if you don't use the vamp dust. The vamp dust just guarantees you'll get one.

Carried traits are those by themselves (ie NA, NB, NC..etc) and pets can get those from completing one of the boost levels.

Hope that makes sense.