Something interesting about Phantazia, is Maria Hill mentioned she had gone crazy because she remembered everything about the House of M reality, where she was one of the bodyguards of the Magneto family.
If they ever repower her, it could be a situation in which Polaris doesnt know her (although I think they may have fought in PAD's X-Factor), but Phantazia has years of memories of Lorna and her family.
she was the first to notice they were under attack