Like the other Children of the Vault, Serafina is not a homo superior (mutant) or homo sapiens sapiens (regular human being) but the member of a completely different human species that has evolved biologically, culturally, and technologically over the course of six thousand years. Her people's advanced technology allows her to have superhuman abilities in the form of a special suit she wears; once the battery runs out, however, she'll be powerless.

Because of her affinity for machines (including the biological kind), she could disrupt machine and human senses, sneak into an X-Men facility undetected. Only Wolverine sensed that something was amiss. Serafina's suit had wiry tendrils coming out of it that allowed her to interface with technological as well as biological systems, such as when she plugged into Lady Mastermind in order to use Lady Mastermind's powers on Cannonball with far greater power and skill at her command than Lady Mastermind could ever summon naturally.

Seraphina infiltrates Cannonball's mind

Serafina was first seen tracking Sabretooth, using her psychometric abilities, with Sangre for their evil plans. She was also able to enhance and use the powers of others at will, perhaps as a result of her innate ability to understand biological systems, which is what she did to Northstar and Aurora before she mind-controlled them into attacking the X-Men.

She used a comatose Lady Mastermind's illusion-casting abilities to create a world in Cannonball's mind in which they were married and her name was Sarah. When she was discovered by Wolverine, she turned his adamantium skeleton against him, defeated Cannonball, and fled to rejoin her team.

Later, when The Children of the Vault were attacking the X-Men (and winning, to boot...), Cannonball attempted to reach Serafina through the memories they shared in the world where they were married.

When she told him that she had no real feelings for him at all, he grabbed her and drove her straight into the hull of the ship at full speed, which, as far as we know, killed her. Mike Carey, the writer of the issue, has said in an interview, however, that she may have been merely knocked out and she isn't dead for sure, in contrast to Fuego, Aguja, and Sangre, whom he implied were really dead.