The Nebular Javelin is listed for the Occultism in the game files, with no perk tree yet. Not in Early Access yet.
Nebular Javelin
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 Nebular Javelin is in the game files but not in the game you can play now.
Occultism Nebular Javelin FAQ
Is the Nebular Javelin 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