The Guardians of Forever - Howard O. Fischer - Bog

Nothing appears on the farthest reaches of the final Hubble Ultra Deep Field view except a complete cosmic barren blackness, an infinite dark void, devoid of a ray of light, a chance of life, and even the dust of dreams.
The universe known to humanity has started an incredibly fast and violent dissolution, an end to eternity and everything ever held by those once endless eons. Worldly salvation or destruction can only be provided by otherworldly powers, beings with abilities almost incomprehensible to human beings. Minions of these guardians of good and emissaries of evil, legions of light and dark forces, finally meet in a cataclysmic earthly battle to determine if the universe fails or prevails.
Time is ultimately shown to be terrible and tenuous, fleeting and forever.