Synopsis
(This is a summary of events that happen in every route and connects every plot possible).
The plot begins with the Raven choosing to take a mission for either Vertex or Alliance who after completing the mission was "introduced" to Evangel, Zinaida and Jack-o; The major characters of the struggle.
Throughout the story missions, the Raven learns of that they may be a "Dominant", an extremely gifted pilot who can turn the tide of war. This was a title sought by both Evangel and Zinaida, who are driven to become the strongest by any means necessary. In desperation to be the strongest, Evangel betrays Alliance and winds up getting Triutarate killed trying to follow him. Meanwhile Jack-O puts Zinaida and the Raven through several missions which often pit them against other Ravens with both managing to kill their targets, Jack-O even was so desperate to find the one Raven that he would betray fellow members of Vertex to test the Raven's skills.
The struggle reaches it's climax at the Querr Energy Plant, where the Raven learns of a destructive weapon called Pulverizers. A weapon capable of taking data from its destruction to create a new Pulverizer. It's true destructive potential appeared again when Tartarus Headquarters and the Garav Desert was attacked by another Pulverizer. Meanwhile, Triton Ecoactivity center was destroyed as well, which was a source of biological weapons created by Kisaragi.
The intentions were then revealed by Jack-O, the goal of the attack was not to defeat the Alliance but to destroy the Internecine, a computer system who produced the suicide weapons in Nexus and is now planning to create an unstoppable Pulverizer which will destroy humanity if left unchecked. To do this, he was seeking a Raven who has the potential to be a Dominant and narrowed it down to Zinaida and the Raven. The final ending however is up to the player pending on who he sided with.
Read more about this topic: Armored Core: Last Raven