Cold One Dread Knights

Cold One Dread Knights is a Dark Elves cavalry unit introduced in Total War: Warhammer II. Their charge protected by heavy barding, these mounted warriors wield mighty blades to slash and gore.

Description
Cold One Knights count themselves amongst the finest warriors in Naggaroth. They are nobles of great wealth and ambition, whose warrior instincts elevate them far beyond the upstart cavalrymen of lesser races. Their weapons are the finest that can be bought in the great cities: long swords enchanted in such a manner as to never lose their edge, and tall lances sharp enough to pierce the hide of a Dragon. Their mounts, too, are superior to those of other lands; no horse, no matter how well-trained or carefully bred, could ever hope to match the savagery of a Naggarothi Cold One.

Strategy
Compared to regular Cold One Knights, the Dread Knights gain better melee attack, defence and armor while losing the very important bonus vs large enemies as well as some of their charge bonus. They might be better at fighting infantry, but the Dark Elf army already has elite infantry and very potent missile units to deal with that particular problem. Deploying Dread Knights in addition to that might prove a bit of an overkill and also deprives you of a good answer to enemy cavalry.