Kill 5 Spirit-Bound Sentries and then use the Resonance Crystal to capture the Zandalari Spirits trapped within.
The Zandalari do not tolerate weakness in their ranks, <class>.
Those that are deemed weak are often sacrificed in barbaric ceremonies. The victims' spirits are captured and entombed within the sentries you see guarding the grounds.
I wish to study their essence. For this I will need your help.
Take this resonance crystal and siphon the spirits from the sentry corpses.
Do not allow them to escape!