http://ffxi.somepage.com/itemdb/abjuration.php
I to:
God item NMs (these are the NMs you fight to get the items that spawn the gods, such as Zipacna):
Ambrosia and Amrita abjurations.
The following are ranked in order of easiest to hardest in my opinion.
Genbu (turtle):
Note: God. Hits slow, heard a NIN tank is best.
Zenith hands
Koenig hands
Zenith head
Crimson Feet
Seiryu (wyvern):
Note: God
Crimson hands
Zenith legs
Koenig head
Suzaku (greater bird):
Note: God
Hecatomb feet
Adaman head
Shura hands
Zenith legs
Fafnir (dragon):
Note: 21-24 hours spawn, Dragon's Aery. Kinda easy if you can do it without mistakes and the right setup. Paladin will take 150 a hit, 300 crit.
Hecatomb head
Koenig feet
Adaman hands
Adaman feet
Zenith hands
Zenith feet
Crimson feet
Byakko (tiger):
Note: God. He has triple attack. eep
Hecatomb hands
Adaman feet
Shura legs
Zenith head
Nihdogg (Dragon):
Note: 7 day lottery pop off of Fafnir. Not much different from Fafnir, just more hp, hits harder, and higher defense >.<
Crimson legs
Zenith body (Dalmatica)
Zenith feet
Adaman body
Koenig body
Hecatomb legs
Aspidochelone (turtle):
Note: 7 day loterry pop off of Adamantoise, which is a 21-24 hour spawn in Valley of Sorrows. I'm putting this high up on the list because of adds, although I don't think its that hard... never fought it though.
Hecatomb body
Koenig body
Koenig feet
Shura head
Zenith body (Dalmatica)
Crimson body
King Behemoth (behemoth):
Note: 7 day lottery pop off of Behemoth, which is a 21-24 hour spawn in Behemoth's Dominion.
Crimson head
Zenith body (dalmatica)
Adaman legs
Koenig body
Koenig legs
Kirin (manticore):
Note: God of all gods, trade seals obtained after defeating first four gods to a ??? in Shrine of RuAvitau
Hecatomb body
Koenig body
Shura body
Crimson body
Crimson legs
Taking this information, here's what you would need to kill to obtain all your pieces:
Crimson:
King Behemoth, Aspidochelone or Kirin, Seiryu, Nihdogg or Kirin, Byakko or Fafnir
Zenith:
Byakko or Genbu, Nihdogg King Behemoth or Aspidochelone, Fafnir or Genbu, Seiryu or Suzaku, Fafnir or Nihdogg
Shura:
Aspidochelone twice, Kirin, Suzaku, Byakko,
Adaman:
Suzaku, Nihdogg, Fafnir, King Behemoth, Fafnir or Byakko
Koenig:
Seiryuu, Nihdogg King Behemoth Aspidochelone or Kirin, Genbu, King Behemoth, Fafnir or Aspidochelone
Hecatomb:
Fafnir, Aspidochelone or Kirin, Byakko, Nihdogg, Suzaku
Shura looks like it'll be the hardest to get. Remember, these abjurations are not 100% drops. Since Shura drops from so few HNMs you may not see that abjuration for a while. Also, I would like someone who has fought all these HNMs to reorder my list because I know it isn't correct. So far I've only fought Fafnir on that list, but I know Genbu is the easiest. Fafnir wasn't that hard at all, we were just unprepared and unorganized.