Quote Originally Posted by Frelas View Post
After battling water ragnarok for a couple of times i got a phantom axe.
How powerfull are the new phantom weapons?
is it worth it to go for all axe weapon grid?
They increase the base stats of all the weapons of the same type, and also activate their own often powerful skill(s) when you have 5 or more. As such, using SRs to get a full Axe Grid usually isn't worth it. But if you have five+ Axes in some Grid already *cough*Dark*cough* go ahead and slap that bitch in there.

The Axe isn't particularly good though, since it gives Exceed(++) (nice but not all that necessary) and Elaborate(++) (utter trash). Still, the increased base stats might make up for the loss in Assault.
Quote Originally Posted by Frelas View Post
And lastly is it worth it go give a soul a phantom weapon?
No. Soul weapons go into main slot.