In theory, I'd think that the primal weapons should be relatively similar in strength, but just having that primal's elemental damage / resistance added to them.

Although, if you wanted to do something where the primal weapons were progressive in power, they could set it up where the primal fights were tiered. For instance, Ifrit could be the easiest primal and could be beaten with normal lvl 50 (non-elemental) weapons, then you could use Ifrit's weapons to fight Shiva and so on.

Ifrit -> Shiva -> Garuda -> Titan -> Ramuh -> Leviathan etc.


Hmmm, now I have this strange urge to play Mega Man...