For reference, Haty & Bendigeit Vran are 2 NM's that drop the THF/NIN throwing weapon
Rogetsurin (see wiki link). They don't seem to spawn on Nasomi the same way they do in retail, and I haven't seen them once in a dozen or so attempts, even with widescan, so I'm posting this tread to try to gather anecdotal information for the benefit of myself and others trying to obtain Rogetsurin. Below is what I have to add myself.
Firstly, before I began my search I already knew the item & the NMs exist here because I've seen it equipped on people. I first went out on a chocobo during New Moon before I had RNG or BST to sub for widescan. I checked the general spawn areas referenced on the wiki page, found nothing, then proceeded to search the entire zone during the nighttime spawn window and still found nothing. I asked in MogHouse LS and was told that the NMs spawn only during Full Moon on Nasomi, and have heard the same thing from a couple others since then.
By the next time I went out, I had RNG unlocked so I could use widescan. Still I found nothing during about 8 or so different attempts during different Full Moon phases, often searching from 17:00 to 6:00 and checking the entire zone. Sometimes I was the only one in the zone the whole time so there was little chance it was killed by someone else. I conversed with others looking for the NMs at the same time and they couldn't find them either. An LS mate who has seen and killed them multiple times in the past came out with me and he saw nothing.
I asked in MogHouse and my main LS if anyone's seen either NM lately and got no affirmative responses, so I began to wonder if maybe the NMs have been removed. A short while later I got word that an LS member found and killed Haty the night before at H-7 during 83% Waning, so outside of Full Moon. Now I had a confirmed recent sighting though, good news. That made me wonder now if the NMs spawn any time BUT Full/New Moon. So I went looking again for 4 or 5 nonconsecutive nights sometime between New & Full. Still no sign whatsoever... That's the extent so far of my search. I haven't yet tried to look on an 83% Waning night, but I should check it out. Now I wonder if their spawn cycles are spaced apart by same amount of time as in retail, but simply "transposed" if that makes sense, so that they spawn nightly for a while on regular cycles still, just not coinciding with Full/New Moon anymore.
What has your experience been with these NMs? The more recent the sighting, the better