After the series ended and all the X-Titles were revamped, in 2001 Frost appeared in "New X-Men" as a teacher for the mutant population of Genosha, which was then controlled by Magneto. After a Sentinel strike leveled the island nation, the X-Men found Frost amidst the rubble with a "secondary mutation" which hardened her skin to a diamond-like density. Using Frost as a character was suggested to writer Grant Morrison on his website by a fan. While Morrison initially had no plans to use her, the death of the character Colossus left Morrison with an opening. He created Emma's secondary mutation – a super strong diamond form – as a replacement for Colossus' powers and added her to the cast. Subsequently, Frost joined the X-Men. This would lead to her instigating an affair with fellow X-Man Cyclops, who was having marital difficulties with Jean Grey. This series also provided further glimpses into her past, introducing her father Winston Frost and her brother Christian.