[PSX] Rockman x4 | ロックマンX4 | Walkthrough #13 | Sigma Battle 

"Repliforce are the fools this time! Now, all that's left is to destroy Earth with the very weapon they made!" -Sigma
Sigma was thought to be suppressed forever after Zero distributed the anti-virus created by Doppler, but he still manages to return. In the introduction of the game, Sigma, assuming a Grim Reaper-like appearance, acts as a double-agent between the Mavericks and Repliforce, a benevolent squadron of Reploids who assist the Maverick Hunters. Sigma's true motive is to conspire against Repliforce and turn it into a rogue enemy. He stages the bombing of the airborne metropolis Sky Lagoon, which plummets to the ground in the opening of the game.
With in-fighting between the Hunters and Repliforce threatening to destroy them both, Sigma increases his influence over the paranoid General of Repliforce. The General, an outspoken advocate of Reploid independence, loses all faith in peace and prepares a satellite laser attack on all humans, which is Sigma's real intention. Fortunately, Mega Man X storms the space weapon and stops the General before he can turn its sights on Earth. In the end, Sigma is revealed as the true mastermind and battles X himself, armed with a new body and a scythe. Despite his defeat at X's hands, he succeeds in part by destroying Repliforce.
If the game is played with Zero, Sigma reveals a portion of Zero's past involving their first encounter that possibly made Sigma a Maverick.
Interestingly, this is the only game where all of Sigma's audio pre-battle quotes are threats (e.g., "Tremble with terror! YOU ARE FINISHED!", "Prepare to become space dust!", or "Are you ready for your final journey?!"). Also, despite being the final boss, his attack patterns in this game are simpler than some of the other bosses.
Another interesting fact is that Sigma's reasons for General, as well as all of Repliforce, to rebel is that humanity and the Maverick Hunters as well, seem to want to destroy anything that isn't fully compliant. Foreshadowing Dr. Weil's conception, as the latter gives a similar description of humanity.
Sigma's grim reaper form is the only time in any X series game were you cannot progress without using a special weapon; simply because it can only be damaged by X's Rising Fire or Zero's Ryuenjin.
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