"This issue also stirred up much buzz as it was publicized as shining some light on the “Xorneto” debacle that has been around in recent X-Titles. In New X-Men (1st Series) #115, Magneto apparently died on Genosha, but was revealed alive under the guise of Xorn in New X-Men (1st Series) #146, where he destroyed the mansion and took Xavier prisoner. He apparently though was on the drug Kick and under the influence of the malevolent bacteria known as Sublime. Magneto was killed by Wolverine in New X-Men (1st Series) #150. However, in Excalibur (2nd Series) #1, Magneto was revealed alive and well in Genosha and the Magneto that was killed in New York by Wolverine was an imposter. However, only Magneto and Xavier knew about this. Thus, the “evil” Magneto in New York was dubbed Xorneto by fans. More complications ensued when a Xorn II was found, apparently the brother of another Xorn. “Xorneto” seemingly did not make up the identity of Xorn, but actually was disguised as Xorn I, the dead brother of Xorn II. When Strange implies that Wanda may have resurrected Magneto, though, it does not shine much light on which Magneto. There are many different scenarios that can be played out. First, Magneto could have died on Genosha, then was resurrected in the only image that Wanda knew of Magneto (evil tyrant) and died as Xorneto, only to be resurrected again on Genosha as a more idealizes Magneto (loving caring father). A second theory is that Magneto died on Genosha, Xorneto truly is an imposter, and Wanda resurrected the caring and nice Magneto in Genosha. Finally, Magneto did not die in Genosha but Wanda did not know this and made Xorneto in the only image she knew of her father (evil tyrant), and the real Magneto was on Genosha all along. For now, the complicated saga of Magneto/Xorn/Xorneto remains unresolved. " -UncannyX-Men.net
Either Grant Morrison f***ed things up or Chuck Austen, Bendis and the editorial team f****ed things up....
Morrison knew Magneto was going to be brought back after Planet X, he just didn't know how. He DID leave future creative teams a "back door," via the fact that Magneto's unstable, tyrannical personality was a result of Sublime.
Austen, Claremont's redressings, however, didn't even mention Sublime and thus we were given the cocktarded Xorneto-Explanation. Actually, I don't blame Claremont for this, or either Austen. The editorial team completely failed to pick up on the back door Morrisson had left them; I don't think they even got the meaning of the story. And just in case there were any remaining Xorn fans to exploit, the editor ordered Austen to incorporate "Xorn II" into his title.
So let's get this straight once and for all. (Kuan-Yin) Xorn was always real and had a twin brother (Shen Xorn). Esme (Stepford Cuckoo Telapath) introduced (Kuan-Yin) Xorn to Kick and thus became a Host to the Bacteria, John Sublime. Wolverine reveals to Jean in the alternate future 'Here Comes Tomorrow' that "Magneto[Xorn] killed you on orders he never understood". Xorn started to change personality and motives because of Sublime. Please remember that the events of Xorn becoming Magneto where just before Avengers Disassembled crossover. The Scarlet Witch (in her madness) changed Xorn to Magneto without ever even knowing she did so. So, under the influence of Sublime and the Reality-Warping powers of the Scarlet Witch; Xorn became Magneto, almost destroys all of New York, and kills Jean Grey (who is currently possessed by the Phoenix Force at the time). Xorn-Magneto says that Xorn was a character he made up (which was either a lie or he did not know better), even though he still hears Xorn in his head. After these events Magneto is found alive and Shen Xorn (the twin brother of Kuan-Yin Xorn) is discovered. The Avengers Dissasembled Event occurs revealing the Scarlet Witch to be insane and her Reality-Warping powers are going crazy. Just then, the real Magneto shows up in the clothes that Xorn-Magneto was wearing and retrieves his daughter. In the 'What If Event Horizons' trade paperback it is revealed that when the real Magneto appeared, the Scarlet Witch's reality-warping powers were affecting him as well (Made his outfit like the Magneto Imposter, Xorn!!). The House of M event occurs and afterwards, in the wake of the Mutant Decimation, the Collective is created. The Collective is lead by the Kuan-Yin Xorn personality (but it is important to note that this the personality that was changed by Sublime!!). Even though Kuan-Yin Xorn died moths before Decimation occured, his energy existed well after his death and was absorbed by the newly created Collective. Kuan-Yin Xorn/The Collective then searches out Magneto to give back his powers.
Hmm, interesting read.
Explains a lot for me, the last X-men issue I read before I read House of M happened to be the one where Xorn/Magneto's head got cut off (or maybe one issue more). So now I know why he suddenly was alive.