The cultists meditate at an Abyssal Marker to travel swiftly to their master out at sea. Use it to reach Fathomlord Budlopudlul, and end his threat for good.
Once you are victorious, alert Gramaton Station, while I send word to Meridian.
We've been harassed by Abyssal monsters here for weeks - it's good to know you've slain Fathomlord Budlopudlul, their leader. Perhaps those beasts will go back into the deeps now that their master is dead. We have bigger fish to fry...