The Twinblade is listed for the Occultism in the game files, with no perk tree yet. Not in Early Access yet.
Twinblade
Occultism weapon · not in Early Access yet
Not in Early Access yet
No perk tree in the game files yet.
Early Access · build 26495283
Not in Early Access yet. The Twinblade is in the game files but not in the game you can play now.
Occultism Twinblade FAQ
Is the Twinblade in ArcheAge Chronicles?
Not in Early Access yet. It is in the game files for the Occultism.
From the game files: Early Access · build 26495283