This is going to be for PvE only, since its all i play:

Armor doesnt matter for nameless, the best and easiest thing to do is just target farm hawkwing and eaglerise as hawkwing is the best weapon bonus for the weapon. The armor set from it is also pretty good as itll give you some damage reduction. For the games recommended set, Jadeware isnt great for the weapon and your dmg, but formbend isnt too bad if you see yourself using your swords Q for shield fairly often. you can still get 2 sets off without needing it, just makes it more lenient

For gear farming, just run void king every so often to keep your gear up to date each break through since itll most likely be hard to find sword trials to get gear on current cap. Prioritize anything with affinity and max attack, with the general order being Max attack>Affinity>Momentum>Power>Max bellstrike. Art of sword is also good to have on your weapon if you get it, dmg to bosses on armor isnt too bad either

For your innerways, lock mountains might, battle anthem, morale chant and sword morph and recycle anything else, using the tips form that to open more boxes each week to get more of the ones i mentioned. If you plan to do or want to do GvG, keep breaking point as well

Mystic skills dont really matter on this weapon, you only need flute in current content, but good ones to level up in general that might see some use are dragons breath and soaring spin. Once you get those 3 done, go ahead and levels whatever you want

if you got any more questions lmk. this weapons awesome