The upcoming DLC for Total War: Warhammer 3 titled Tides of Torment will introduce Dechala as the new legendary lord for a Slaanesh faction.
The DLC will also feature a Norscan faction led by a treacherous mutated Norscan sorcerer named Sayl the Faithless, who specializes in betrayal and manipulation.
Sayl the Faithless can summon a special Chaos Spawn called the Nightmaw, made up of the bodies of three wizards he previously betrayed.
Additional updates include new units like a fimir noble and a chimera, rework of existing mechanics, voice updates for legendary lords, and an expansion and rebalancing of ancillaries in version 6.2.