I think I found my new combination

On my right hand, GSoA. On my left, Gravelord sword. Two of my favorite swords, in terms of looks. Not only that, the Gravelord sword has toxic, so I can use that in combat. As a plus, I look badass when the Gravelord sword is on my back for some reason.

Never tried GL sword in left, is the attack fast?

It's not bad, it does a nice punishing swing, like the katanas should have done. But both light and heavy attack do exactly the same attack, so you can't block with it.

I don't block so that okay. The best part about it is that it inflicts toxin even if they dodge. Though what I find funny is that you swing it faster in your left hand rather than your right.

I wish weapons had a more varied moveset in the offhand... I toyed with a greatscythe in my offhand for a while, but found it wasteful to only have 1 usable attack with it. Other than catalysts, parrying weapons, or ranged weapons, I only really find a long spear be useful in the offhand, for the occasional pressure-poke.

It's interesting that the GGS is faster in the offhand though. But I would still be annoyed at only having 1 move with it... But that's me! I wasn't saying any of this to taint your enthusiasm--just me going a bit more hollow. Enjoy your build!

Too bad the greatswords are horrible in off hand, same speed attack and block lol