This quest is given by clicking on the scroll in the first floor room of the Tower of the Four Winds.
Enter instance (lvl 57). You are required to kill 50 Terracotta Warriors (57-60) in 30 min. You appear to get no XP from killing the warriors, so no mini-dings. The MOBs also do not respawn. It seems to be about efficiency and race-the-clock.
