Nothing is a must but these can be very useful/fun and more varieties exist: [u][b]PVE[/b][/u] [b]Albedo Wing[/b] >> eddy+volt (very fast reload when amped), close to melee is just excellent, desperate measures procs x3 in 2 glaive melees (easiest 30%+) which then would spread x3 to any other desperate measures weapons on you, I believe there is a build for collective action (fallen sunstar makes sense) [b]Avalanche[/b] >> incan+dragonfly, sub+incan, I always keep a Target Lock + AutoLoading (my style) [b]Glacioclasm[/b] >> envious assas+reservoir burst/controlled burst..may be nice to have withering gaze as 2ndary perk [b]Mistral Lift[/b] >> envious ars or assas or recon + B&S or High Ground [b]Stay Frosty[/b] >> Rimestealer + Headstone, [b](edit)[/b]Frenzy + encore is nice (tested) [b]Zephyr[/b] >> Coldsteel (like chillclip on a sword) + AO/Rimestealer/Strat/Relentless may have use [u][b]PVP[/b][/u] I just recommend you keep as many interesting rolls as you are willing to try out of Stay Frosty. It looks like it will be a strong weapon. Some like Glacio (see legoleflash youtube for anything fusion).. Albedo for the glaivists.. I have even had a Mistral Lift absolutely destroy me in 1 crucible match.. so depends on your style. I tried Avalanche w/closing time various bar/mag in PVP and not a fan.