The Diablo head I used on the box cover was obviously from the wallpaper copyrighted by Blizzard in 2004. Now I'm gonna make some pretty hasty assumptions.
The Blizzard North team was gone by 2004: all the leads behind Diablo were gone. Now, it seems odd that Diablo's eyes in the picture are glowing, indicating life, however, his Soulstone is gone. His skin on the skull is also decayed off, so it has been some while since he has obtained life. I dunno, but it seems suspicious.
the most obvious answer for me is that diablo was brought back as an undead. But i have a problem with my own theory and that is how would diablo be undead if whent he last of the three brothers died all undead and demonic were supposed to be banished
"Hmmmmmm.........nothing nevermind, actually, nope nope forgot, oh wait, hmm damn guess Ill never know, oh wait a second!...shit lost it again"< thats whats going on in mey head right now thats="" whats="" going="" on="" in="" mey="" head="" right=""> thats whats going on in mey head right now>