Just killed it again for my second character, my Galka NIN already has one. Not sure how long it took to spawn, we were killing PH'ers earlier in the day, doubt anyone else camped, then LSmate was doing same later for at least an hour. Went to kill 2 shadow NMs, came back, spent maybe an hour more killing pops, he left (ring was for his PLD), next pop after he warped was NM.
If you are going to melee it as RDM/NIN, think twice. Use Platoon Dagger or Beestinger or both, hope to get mostly zero damage hits. I actually died as 75 RDM/NIN but because I aggro'ed a Mousse when I bound and tried to Sneak to zone. Then another. Stupidly I had left all three other pops up without killing because I was a little excited even though I was the only one in zone. I still made it to the path up before dying to like 9 undead and 3 slimes, lol.
Anyways, came back RDM/BLM with my brother on his 75 BRD. NM was still heading slowly back to spawn point, I bound, Fire III, pulled him near entrance and lower mobs, nuked-kited, Convert'ed once, and finished him with Fire III > Blizz III > Thunder III. Fight took maybe 6 minutes, Grav did start wearing towards end, but very easy this way, only one Fluid Toss, no adds, no undead aggro, got ring. Nice little item for my ninja and RDM.
In retrospect I think NIN/RDM would have been my choice. Elemental wheel and higher evasion at 69 than RDM at 75. NM is not accurate, does not hit hard, only Fluid Toss is dangerous.