Been brought up before, also similar question to why no zodiac/celestial spear or scythe.
Well, that actually makes sense, as Factions was released before NF, so there weren't any scythes or spears. They COULD add them in, and I don't see why not since they added scythes/spears to tyrian endgame greens and canthan endgame greens.
Also, there are no slaying mods for daggers, spears, or scythes.
imo zodiac is the best skin line of all the weapons. they all look functional and pleasing the eye. all my martials have multiple zodiac weps. my casters would love the foci, gogogo anet
Some sets have few weapons, and others are related in names, but not in design, and others have similar design, but not names:
* Ghostly/Eternal
* Nightmare/Plagueborn
There are also different skins that share names and different names for the same skin.
I wish there were a bit more of uniformity in that.