I've spent a bit too long making money on this game and have yet to go to fsc and beat vanaduke.
This will probably the set and weapons I will bring:
Nameless Hat
Nameless Poncho
Wise Owlite Shield
Cryo Driver (the only weapon I ever need)
Blackhawk (deals anything my cryo doesnt)
Ascended Calibur (so reliable)
I'm a gunslinger, so really I don't. But I got a faust and vile striker for jelly king, I don't mind getting an avenger if it would help me at fsc. I have a spare weapon slot anyways and my I don't think the rest of my collection of guns will help me on the journey.
Seriously, I think the ice gun is all I need LOL
Still finding hail driver recipe!
No, you don't need a divine avenger. For elemental damage, I'd prefer my glacius. Just because a lot of other people want some particular gear doesn't mean that you should want it, too, or even that the gear is all that good.
That said, I'm not saying that you need a glacius, either. If you mostly use guns, then a normal damage sword such as what you have will let you use a sword against whatever you need without a damage penalty. That means you can carry only one sword, and leave spots open for multiple guns, as seems to be your preference.