https://imgur.com/oSAh1pu When will come centaurs to thundermist? Defender Rowan say:"To Arms! A centaur raiding party is attacking!" But Centaurs does not respawn
(1) This belongs in the Quests and Seasonal Events forum, this forum is devoted to decorating homes and such. (2) The attacking centaurs encroaching on Thundermist are kind of a set dressing. The NPC guards call warnings, and small groups of centaurs show up and attack from time to time. (3) If you need to kill centaurs, take a griffon to the Coldwind Griffon Station 9236, -22, 1348). There are centaurs aplenty in that area, and also around the Ulteran Spire (1164, -25, 161).