If you want your EMBLEM quest line to open up you must complete your Gunslinger PVP quest line First. Once you have the Emblem for your Gunslinger you will be offered your Blade dancer Quest line. I tell everyone reading this TO GET YOUR EMBLEM FOR YOUR SUBCLASS YOU MUST DO THE PVP QUESTS FOR THEM. THEY ARE NOT VANGUARD RELATED. Thank you for reading have a nice day 😊