PSA:Lux shield is S tier and youre still building her full ap support
Not gonna go into a ton of obvious strengths and weaknesses she has here, her cc, her uptime, or her burst potential. Most of you know these aspects of lux well,** but i feel that her shield has always been grossly underestimated.**
It offers zero utility(aside from ardent). It does offer misplay, it is back end loaded, and it takes a little time to get used to. But it also offers one of the more rewarding(and large) shielding experiences in the game when performed well.
Of any viable/semi viable support, on numbers alone, lux has by far the strongest shield. 1650+60%ap+aery/itemmods with an optimal cast. This is more effective hp to a team than an entire level 18 adc, and more than locket almost ever offers on a 6 second cooldown. Try building any assortment of
,** As her shield is huge, these offer much larger bonuses to lux than i feel are intended.**
At worst its a self shield that is still only beaten by karma's mantra e. With even a half decent cast it quickly becomes one of the strongest shields in game.
Learn how to land her shield with some efficiency**, and i think you will learn that there is a glaring hole in the current support meta that is shield bot lux.

's shield as "meh" tier. Yeah it's big, but it's practicality is limited as it can miss and it isn't instant for teammates. It still has a travel time and is somewhat telegraphed, whereas
and
shields are instant and lack counterplay. If you're going for teamwide shield strats, you may as well play

"Standard" AP support item and other boot option for more roaming
are very situational, former because you need to be ahead and latter because it's so expensive. I only use them rarely.