The Abbantis Vellum was the global war around three centuries ago which resulted in the unification of the Waterbe under a single polity. It occurred after the Valena-born leader of Vallum sweared fealty to Valena under the name of the Imperial Protectorate of Vallum as part of the Impatinum Unistarch. The Impatinum Unistarch then declared their rightful territory as being the entire surface of Unistarch, something which was obviously met with distaste by the other Waterbe inhabitants.

Around 35 years later, with many cities having been reduced to irradiated rubble, the remainder of the Waterbe became convinced of the divinity and rightful rule of the first Waterbius of the Impatinum Waterbe.