Total War Warhammer 3 update 4.0's full patch notes are here
Total War Warhammer 3 update 4.0 patch notes are here, and they include free legendary hero Aekold Helbrass and balance changes alongside Shadows of Change.
Aekold Helbrass Creative Assembly Total War Warhammer Legendary Hero Legendary Landmarks Immortal Empires
Source: pcgamesn.com