Armored Core: Last Raven features several multiple endings, but there is one extra mission taking place after the 'true ending' where the player becomes the last remaining Raven alive.

(But for that, there's always the Internet) Not every game will Foreshadow that this foe even exists in the first place or how to find them Guide Dang It! and sometimes even an official strategy guide will intentionally avoid spoiling them in advance. In some cases you may not even be able to fight them on your first attempt at the game, being reserved for New Game+ runs (typically when this happens it's because you're able to use knowledge or abilities that weren't an option during the original run but now are possible because of the differences in your character from the last time you were in this position alternatively it could just be that something new was permitted from the original playthrough). Exactly how to unlock the True Final Boss varies: It may be as simple as playing the game on a higher (or the highest) Difficulty Level, or it may involve achievements like a Speed Run, No-Damage Run, 100% Completion, or some obscure Gotta Catch Them All Side Quest, or the boss may appear at the very end of an unlockable Boss Rush mode after the main story.

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