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.$B$BBring me their still-twitching antennae, and waste no time, $N, for harvested antennae will not twitch for long.  Bring me the antennae in the time allowed, and you will pass the trial.