HB PANTS HAVE LANDED!

does it have a main line?

All equipments have a main line, in this case, the +8 LUK one. As you can see, it gives more stats than the other one. There was a thread explaining it quite well. The secondary lines match with the main lines of the next tier in the below potential grade. Example, a epic equpment has secondaries that match in resulsts with rare's MAIN ones.

The potential skills are all MAIN, and UNIQUE. That's why it has to be unique in the first place. If the item is lucky enough, it may have two main lines, and therefore, more chance to get the skill whenever it becomes unique.

wtp is a Main line? Every item has a primary stat, if that's what you mean. The third line has a chance of being primary and so does the second line.

Ok, that, different names, same thing.