Trial at the Field of Giants

To pass this trial, you must travel south to the Field of Giants. There you will find a host of crawling, insect creatures. They are new to the Barrens and I do not like what they herald. Bring me their still-twitching antennae, and waste no time, <name>, for harvested antennae will not twitch for long. Bring me the antennae in the time allowed, and you will pass the trial.