There is a hidden mini-quest in Uldir to kill 3 bosses per week - on completion, this empowers your Reorigination trait found in Laser Matrix and Archive of the Titan raid Azerite
The Effects of Reorigination Array in Uldir Explained - Wowhead News
Uldir LFR Bosses in 5 seconds: Mythrax the Unraveler and G'huun the Blood God
Uldir Raid Boss Guides for Battle for Azeroth - News - Icy Veins