You were told that Wild Taygas attack the wagons going to Impetusium. Acquire a Wild Tayga Fang to send them a message.
Step 1. Bring a fang to GulkallaAn Archon Centurion dispatched to supervise the Impetusium Reconstruction Project in Altgard. He is supervising the project in the Heart of Impetusium, at the center of Impetusium.. (You need to collect: Wild Tayga Fang)