Fenrir here. Been camping Gulool Ja Ja for almost a week straight. So far there have been 3 Mamool Ja Besieged that have occurred and Ja Ja has not been to any of them. GM call tells me to consult community sites. Medusa has already spawned twice since my ls killed it a week ago. Either these NMs are completely broken or there really is some kind of secret requirement to pop them that no one knows about.