FF7

[VeyaAkemi]

One of the final bosses of ARR is literally the Ultima Weapon, we then proceed to fight the Ruby, Emerald, Sapphire and Diamond Weapons in Sorrow of Werlyt, this is on top of all the other FF7 references peppered all over the game, and our melee LB1 and LB2 use the Buster Sword, with the Bladedance LB being modeled after Cloud's Omnislash Limitbreak.

There is a ton of FF7 stuff all over the game, just unlike the XI, XV and XIV collabs, they are permanently integrated into the game rather than limited time recurring events, this is the same for every other FF except the 3 mentioned.