Nimbus

Some transformations are so complete that you are no longer human. Nimbus never related the circumstance, but whatever triggered her breakthrough transformed her into a being of pure intangible energy. To relate to others, she shaped her body of light into a form approximating the one she had before, appearing like a glowing angelic nude with the details smoothed out for the purposes of modesty. She could fly at the speed of light, focus her power to project bolts of incredible energy, and was of course intangible and immune to most forms of physical damage.

Nimbus' powers made her the Chicago Sentinels' deadliest member. She died in the Whittier Base Attack, killed by an A Class Projector-Type whose "sonic" attacks disrupted atomic structures of any kind.