FateHeaven's Disaster (ZeroUBWHeaven's Feel)

Original Arc with a mix of Zero, Unlimited Blade Works, and Heaven's Feel with a mix of minor Fate/Politics. Kiritsugu(Zero) Saber(Zero) Archer(UBW) fight over Shiro's Destiny (AU). Because of the approaching Heaven's Feel finalized, Gilgamesh does whatever he wants. And Avenger becomes the Heaven's Feel Vessel version of Berserker. Fate/Fan Input Welcome