Vanguard Barrage

Tal'Darim Vanguards are basically copies of usual Khalai Immortal assault walker, but they lack hardened shields. Instead of a set of sophisticated phase disruptors of the Immortal, Tal'Darim fitted much simpler weapon - a multiple rocket launcher system. Ironically it makes Vanguard much more effective due to splash damage. Nearby Havok(s) (Tal'Darim version of Sentry) increases its range with its/their Squad Sight passive, what makes it excel as a siege unit as well. Zealots of all variants (though Centurions are the best in this case) can help hold enemy units in place while barrage is en route.