The XV8-10 Upsurge Battlesuit, (Tau Lexicon: Her'ex'vre Or'es'vral) is a largely discontinued model of Tau battlesuit that was engineered by the Gai'kal Sept in 739.M41 during a period that would become known to the inhabitants of the world as the Va Lyo'au, or Great Isolation. Designed to be a heavily armoured siege battlesuit equipped with high output twin-linked heavy weaponry, the suit's cumbersome appearance and somewhat clumsy walking cycle has earned it a colloquial title by some of the rank and file of the Astra Militarum as the "Tau Dreadnought".