I'm gonna start working towards this myself. From the stats, this is definitely superior to the Company sword, and dual-weilded with my Justice or Joyeuse would be an absolute beast.
This sword is awesome! From the look down to the stats, Its just too bad you have to sacrifice 55 hp, but oh well. Its still awesome. Its nice to have pld wield a demonic type weapon.
Obtained from Achamoth, a Tier III Zeni Notorius Monster
Achamoth, being a Tier III ZNM, must be unlocked by obtaining the following pop items and defeating the corresponding ZNMs. All of the ZNM pop items are attained from Sanraku (E-8) in Aht Ugran Whitegate. To purchase pop items, you must acquire Zeni by trading Sanraku pictures (Soul Plates which have captured monsters). You obtain Soul Plates and Soultrappers (a camera type item) from Zandjarl who is located at (F-7) in the Colosseum, which is connected to Whitegate.
So to acquire the Organics Sword,you must first kill the Tier I NM such as Brass Borer (additionally you can kill Claret or Ob).
Obtain a Shadeleaf from Sanraku.
Trade the Shadeleaf to the ??? in the Gates of Halvung around (I-7) (J-7)
Defeat Brass Borer.
Trade the Cocoon Item Brass Borer drops to Sanraku.
This will unlock the Tier II NM Anantaboga (additionally you can kill Dextrose or Reacton).
Obtain a Raw Buffalo from Sanraku.
Trade the Raw Buffalo to the ??? in Mount Zhaylom at (E-6)
Defeat Anantaboga.
Trade the Anantaboga Rare/Ex drop item to Sanraku.
At this point, the Tier III NM Achamoth will be unlocked.
Obtain a Rock Juice from Sanraku.
Trade the Rock juic to the ??? in the first map of Halvung at (H-4).
Defeat Achamoth.
Here are some details about Achamoth
Achamoth is weak to lightning and ice.
Will summon an Achamothcampa every 60 seconds.
Achamothcampa are either immune to physics or magic damage.
They die quickly if the proper type of damage if dealt to them.
If an Achamothcampa is left alive long enough after being summoned, it will turn into an Achamoth Nympha.
Achamoth Nympha have high HP.
The Organics drop rate is currently unknown. Achamoth is reported to be capable of dropping multiple Organics.