In the 2008–2009 storyline "Dark Reign", Frost, after waking from a vision about the Sentry, is invited to join Norman Osborn's Cabal. At the meeting, it is revealed that she and Prince Namor share a romantic history. During her days as the White Queen, Sebastian Shaw sent Frost to convince Namor to join the Hellfire Club. Instead, Namor took her to his kingdom and they began a relationship. Believing Frost to have betrayed him for Namor, Shaw sent a reprogrammed sentinel to Atlantis, attacking the two and destroying the kingdom. When Namor confronted Shaw for his treachery, Sage took a telepathic hold of Frost, erasing her memories of Namor, who vowed revenge on Shaw. In the present, Frost reveals that after her initial battle with the Phoenix she pieced her memories of Namor back together. She makes a pact with him, seducing Shaw and using her telepathy to make Namor believe she has executed him, while secretly telepathically incapacitating Shaw. Per their deal, Namor vows to protect mutant-kind as his own people, while Frost, more determined to fill her role as a leader of mutant-kind, contacts Scott to have Shaw captured by the X-Men for "crimes against mutant-kind." Approaching him later in his cell, Frost reveals that she has captured Shaw for Namor and on the basis that the Sentinels he commissioned were ones later used by Cassandra Nova to destroy Genosha. She sentences him to remember nothing but the faces of the Genoshan victims using her telepathy.