Travel south to the next island, then east to the next, Thesalene Island. There is a large fort filled with Mosswart Townsfolk at 78.2S 86.7E and kill 40 Townsfolk.
Return to Kryst and speak to Massein again for reward.
Corporal Massein tells you, "Hail, warrior. Have you come to help the defense of Kryst? The sheer number of Mosswarts in the jungle and assaulting the town are overwhelming us."
Corporal Massein tells you, "I have a specific way that you might help. We need warriors who are willing to strike a blow at the heart of the Mosswart holding."
Corporal Massein tells you, "Slay forty of the Mosswart Townsfolk who live in the Mosswart holding, then return back to me. Good luck, warrior"
Corporal Massein tells you, "Hail, warrior. Have you come to help the defense of Kryst? The sheer number of Mosswarts in the jungle and assaulting the town are overwhelming us."
Corporal Massein tells you, "Well done, warrior. You have slain all the Mosswarts that I requested of you."
You've earned 15,000,000 experience.
You have been granted the title Defender of Kryst
Notes
During the Learning From Experience event, the experience reward was increased from 1,022,688 (10% up to level 60) to 15,000,000 (??% up to level ??)
Timer of 13 days is assumed based on standard length of kill task timers.