ambushed by Mavericks after meeting up. Vent/Aile escape the area while Giro covers their retreat. Here, he/she meets with Prairie, the leader of the Guardians, but their meeting is cut short when a Maverick attacks the group. Model X lends its strength to Vent/Aile, allowing him/her to "Megamerge" and transform into Mega Man Model X. With the help of Model X, the Maverick is destroyed. After finding Giro, in the form of Mega Man Model Z, they board an airship deemed the Guardian's headquarters. Later, a Maverick attack is spotted at the Slither Inc. main office. The duo meet the president of Slither Inc., Serpent, and his Reploid guardians, Prometheus and Pandora. Serpent reveals his knowledge of the Biometal and says that he's also a Mega Man, possessing Model W. He expresses his intent to find the Model W Core, and leaves, but not before possessing a weakened Giro with the power of Model W. A fight ensues, mortally wounding Giro. Giro hands Model Z over to Vent/Aile during his dying moments and transforms into a Cyber Elf. By "double mega-merging" with both Model X and Model Z, he/she uses the form Model ZX to escape. Now the Guardians, including Vent/Aile, must recover eight Biometal fragments and stop Serpent. After finding four of eight Biometal pieces, the Guardian HQ comes under attack from Mavericks, led by Prometheus, with Vent/Aile aiding in the defenses. He/she succeeds in defeating Promethus before recovering the rest of the pieces. Upon retrieving all eight Biometal pieces and their passwords, Vent/Aile is able to enter a secret location and find Model W. However, Vent/Aile is stalled by Pandora and the Biometal is moved elsewhere. Later, Vent/Aile receive a signal from Model W, located at the Slither Inc. Head Office. Vent/Aile set off to destroy Model W. After battling through Slither Inc., Vent/Aile face off against Serpent, who feeds the Model W core with several innocent Cyber Elves, and then fuses with it. Vent/Aile suddenly reverts to human due to the realization that the hatred of the Mavericks that he/she has kept inside his/her heart is the last thing needed to unleash Model W's full power, thus resulting in his/her temporary defeat. However, after gaining courage from the Biometals, he/she merges into Mega Man ZX and challenges Serpent to a final battle. During the battle, the tower collapses, destroying Model W and killing Serpent. Vent/Aile reunite with