You generally don ' t solo anything past silver if your kit doesn ' t have innate survivability ability . There are two infiltrators that do that which are Turian Ghost , which uses stimpacks and AIU which uses the Matrix both suffer from staggers despite being two most powerful survivability abilities . It ' s hard enough to solo with them , if you ' re trying to do a solo with a character that doesn ' t have anything to restore shields or increase dmg reduction , you either are a masochist or have a shit ton of spare time and patience . That being said N 7 Shadow built for ES sounds good bcs you can keep in cover but suffers from backdoors and anything that is tougher than centurion can just survive anything you throw at them . I used to spec everything around solo gold , but seriously I just don ' t want to spend 30 minutes to get killed on wave 10 during device enable . If you spec N 7 Shadow for SS it ' s just a big help for the team if you have one bcs they ' re gonna finish the enemy even if you die in the process , if you have a proper comp there is someone that will pick you up . You can disagree , it ' s just my opinion , but personally I just feel that it ' s the only practical use for N 7 Shadow .