Braid of Bordeleaux

 is an enchanted item added in Total War: Warhammer II Doomsayers Update. It is a legendary item for Alberic de Bordeleaux.

It is a hidden legendary item. The quest is triggered when Alberic de Bordeleaux reaches rank 12, and requires the player to capture and occupy Sartosa to receive the item as a reward.

Description
Said to be a braid cut from the hair of the Sea God Mannan, this sacred braid has been held by Bordeleaux since the first Duke of Bordeleaux.

Effects

 * Melee attack +10
 * Enemy leadership -10 (local region)
 * Passive ability: Braid of Bordeleaux
 * Type: Augment (Area)
 * Duration: Constant
 * Target: Self, affects allies in range
 * Effect range: 40m
 * Effects:
 * +8 Bonus vs. large
 * +4 Leadership

Source

 * Reddit thread and Loremaster of Sotek Youtube
 * TW Community forum thread