Anyone have any ideas on the Sentry's nemesis?

From Sentry's Wiki entry:

His Void 'counterpart'/nemesis possesses the ability to shape-shift, and through its control over the weather and darkness it can create destructive storms and deadly "infini-tendrils" attacking the mind. Victims impaled on the tendrils experience traumatic visions of the past, present, and future. Its regular appearance varies between a shadowy, trench coat-wearing villain to a massive hurricane of darkness. It can also assume powers dependent on shape, like a flame form that breathes fire, alternately an armored monster with super strength and toughness. It is at its strongest during the night and in the Negative Zone.