Ok, so after a lengthy debate in my LS about augmenting Thief's Knife, raising the level, yet preventing dual wield, I came to one argument that says it could be done; Relics.

I remember seeing a few...opulent...players running around with Mandau/Baterdeau and Kikoku/Yoshimitsu back at 75 cap, so wouldn't we have seen one of these guys dualing 99/95 by now if it were possible?

What I know is that there are 7 different Mandau, we'll use that as an example.

Mandau - lv 75
Mandau - lv 80
Mandau - lv 85
Mandau - lv 90
Mandau - lv 95
Mandau - lv 99
Mandau - lv 99/Afterglow

My question here is despite the absurdity, is it possible to dual wield Mandau 99 and Mandau 95 or does the Rare/EX prevent this?