Final Comp
Intro
Did you love the first week of Set 9 where you could pick Twisted Fate as your legend and spam BIS Garen reroll with 50 Zekes? If so, this comp is for you. It's another comp that wants super BIS on Nilah of RFC + RFC + RFC to give her autos insane range, allowing them to hit the entire board.
Early Game Board
Almost always take Pandora's Items first augment and start looking for triple Rapid Firecannon. Naafiri is a great item holder for Nilah since she is mosty a glass cannon. She also fits well into the Juggernaut line with Warwick bridging the gap well. Other possible holders are Samira or Jinx. This board is also very flexible, you can add more Juggernauts, Challengers, or even things like Shurima and Zaun on your way to level 7/8 where you will pivot to Nilah.
Mid Game Board
The easiest mid game board to transition with will be holding more Juggernauts since we need them late game anyway. Remember to hold a Jhin on your bench since it'll be hard to find one on level 7/8. If you high roll Nasus, you can play him as your Shurima +1 and then fit Jhin in for Vanquisher for your Darius.
Augments
As noted, Pandora's Items is mandatory or else there's no way you're finding six bows. After that, you mostly want combat augments like Harmacist, Unified Resistance, Know Your Enemy, or Social Distancing. You don't need a ton of items in this comp past triple RFC and some tank items, so I'd tend to stay away from augments that give extra items unless you have to take them.
Late Game Notes
Once you hit level 7, you can fit 4 Vanquisher, 4 Juggernaut, 3 Ionia by playing the final board minus Gangplank. Make sure you don't ignore frontline in this comp, Xayah and Nilah both need strong frontline. After getting your 3rd RFC, immediately start looking for tank items for your Nautilus or Nasus depending on who you're closing to 2 starring.
Backline Nilah since she has so much range anway, she will swipe her autos across almost the entire team. Try to keep Nilah and Xayah same since since Xayah's ability shreds armor.
Late game add a Gangplank since he's a strong unit and he adds Bilgewater to amplify Nilah's damage. Alternatively, if you have a Juggernaut spat, you can play for 6 Juggernaut. This also allows you to fit Aatrox who is an excellent late game unit.