Of course the Moonlight Greatsword is in Armored Core 6

Armored Core 6: Fires of Rubicon continues FromSoftware's long tradition of finding a way to include the Moonlight Greatsword in its games. Despite this not being a fantasy game where swords naturally belong, Fires of Rubicon does indeed have the famed Moonlight Greatsword.Or, as it's referred to in-game: Light Wave Blade: IA-C01W2. The Moonlight Greatsword has been in every game since the original King's Field, though its most famous appearance is in Bloodborne (where it was used by a particular boss). It's a giant sword with a distinct design and a blue glow. It typically also fires off blue energy waves with every attack.In Armored Core 6, the Moonlight Greatsword can only be found inside a chest, which sits in a lake towards the end of the final mission of chapter 4 (the one with the boss fight). The chest is guarded by four enemies, but you could always grab it and boost away without fighting them. Read more