Earlier in the year, Square Enix announced plans to allow for existing armor pieces such as Abjuration armor and Shijin gear to be augmented through Synergy, highlighting in particular a Byakko's Haidate with impressive new stats. Today, new information and a comprehensive first list of augmentable gear has been released.

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From the official Final Fantasy XI forums:

Introduction of Synergy Augments

• • After the synergy process is complete, players will have the chance to confirm the potential augments and choose whether to implement or abandon them.

  • If the augments are implemented, the equipment's statistics will be overwritten.
  • If the augments are not implemented, the equipment's statistics will remain in their existing state.

• Augments that have been added through Synergy can be removed.
• The closer the elemental balance is to an ideal state, the more augments can be added.
• Recipes may be obtained by speaking with the Synergy Engineer NPCs stationed next to synergy furnaces.
• Crafting skills are not required.
• • The first installment of Synergy augments added in the upcoming version update will affect the following items:

  Genbu's Shield / Genbu's Kabuto / Suzaku's Scythe / Suzaku's Sune-Ate / Seiryu's Sword / Seiryu's Kote / Byakko's Axe / Byakko's Haidate / Kirin's Pole / Kirin's Osode / Hecatomb Cap / Hecatomb Harness / Hecatomb Mittens / Hecatomb Subligar / Hecatomb Leggings / Hecatomb Cap +1 / Hecatomb Harness +1 / Hecatomb Mittens +1 / Hecatomb Subligar +1 / Hecatomb Leggings +1 / Koenig Schaller / Koenig Cuirass / Koenig Handschuhs / Koenig Diechlings / Koenig Schuhs / Kaiser Schaller / Kaiser Cuirass / Kaiser Handschuhs / Kaiser Diechlings / Kaiser Schuhs / Adaman Celata / Adaman Hauberk / Adaman Mufflers / Adaman Breeches / Adaman Sollerets / Armada Celata / Armada Hauberk / Armada Mufflers / Armada Breeches / Armada Sollerets / Shura Zunari Kabuto / Shura Togi / Shura Kote / Shura Haidate / Shura Sune-Ate / Shura Zunari Kabuto +1 / Shura Togi +1 / Shura Kote +1 / Shura Haidate +1 / Shura Sune-Ate +1 / Zenith Crown / Dalmatica / Zenith Mitts / Zenith Slacks / Zenith Pumps / Zenith Crown +1 / Dalmatica +1 / Zenith Mitts +1 / Zenith Slacks +1 / Zenith Pumps +1 / Crimson Mask / Crimson Scale Mail / Crimson Finger Gauntlets / Crimson Cuisses / Crimson Greaves / Blood Mask / Blood Scale Mail / Blood Finger Gauntlets / Blood Cuisses / Blood Greaves / Shadow Helm / Shadow Breastplate / Shadow Gauntlets / Shadow Cuishes / Shadow Sabatons / Valkyrie's Helm / Valkyrie's Breastplate / Valkyrie's Gauntlets / Valkyrie's Cuishes / Valkyrie's Sabatons / Shadow Hat / Shadow Coat / Shadow Cuffs / Shadow Trews / Shadow Clogs / Valkyrie's Hat / Valkyrie's Coat / Valkyrie's Cuffs / Valkyrie's Trews / Valkyrie's Clogs

  *Synergy augments will be expanded to include additional items in future version updates.