X-Men Legacy #246
'AGE OF X' CHAPTER THREE!
Rogue has stumbled upon the secret hidden deep within the bowels of Fortress X. And now she's public enemy number one. A fugitive amongst her own kind, Rogue goes on the run...but when your entire world is surrounded by an unbreakable forcefield wall, there's not far to go. Especially when a team of mutantkind's most ruthless killers is hot on your trail!