Venom Knights of Asaph (Necropolis Knights)

Venom Knights of Asaph (Necropolis Knights) is a Tomb Kings cavalry Construct unit introduced in Total War: Warhammer II with the Rise of the Tomb Kings DLC. Channelling her ancient, ageless fury, the Asp-Goddess’ chosen riders bite with her deadly venom.

They are one of the Legions of Legend.

Description
Knights of Asaph's Temple - Nine was the sacred number of Asaph, Ruler of the Snakes, goddess of vengeance and magic – and nine was the number of knights that guarded her temple. Throughout the ages, Queen Khalida had learned to use her knights to perfection, often having them target the enemy that most threatened her army's massed ranks of archers.

Strategy
Simply an all around better unit, the Venom Knights gain more health, speed, melee stats, and charge bonus. They are a much more deadly and efficient combatant than the already efficient killers of the standard version.