Iceborne and Skarn seems redundant. I used a Skarn hammer for a bit to get mastery and I was never getting into Iceborne/Rage/Wild Frenzy range at all. I think the best Iceborne weapon (besides the obvious Repeater build) is any of the riftstalker stuff, since you get a free Wild Frenzy from them. Just wish there was a way to get Iceborne/Rage/Wild Frenzy/Conduit/Cunning-or-Molten-or-Evasive Fury/Aetheric Attunement. Cant find an armor combo where that works out though, best I can do is Ragehunter in place of Attunement. I'm too lazy to git gud enough to play the FOTM Inferno/Predator build, so this is my favorite now. Best part is you can complete the gear long before getting near Rezakiri... worst part is a fuckton of Riftstalker farming if you want all 5 weapons to swap in.
My riftstalker build:
https://www.dauntless-builder.com/b/VKUN7TPCzZcNkcJcdC5TpT2TVTLH3CgEsmFgC3FoizCEecQtRCORsPCYn
My skarn build:
https://www.dauntless-builder.com/b/qBUMMsyCvxHdC1FyUbTETwTgTv5uACAdtbHkCYxHXTrCkCPu6C8BUQCYB
Couldn't see anyway to improve the first one further, second is still kind of a work in progress.
I lucked out good with that Twitch bundle. Hadn't had time to play for a couple days so I had 6 chests saved up and got double bonus on all of them.
Wish they'd put out a damn patch though. Still a few annoying bugs that I hoped they'd take care of as soon as the server issues cleared up.