FOV
Only done 2 items for 50+ gear which was Pluto Staff with Healing Skill +4 :facepalm:, and Defense +1 & 12 Water Resist on Warwolf Belt.
Lvl ~50 done loads of stuff for those lvls, only thing good was Dex+1 and Resist sleep on Combat Caster Sword. Everything else got an element resistance like Beetle Earrings+1, Drone Earrings ect.
ACP/MDK Keys
Ive been doing these alot for specific pieces of gears, it takes time but you can get good stuff.
Got Utsusemi: Ni
Mythril ring with 6 attack and forgot how much Subtle Blow.
Ram Mantle with 2 DEX, AGI and 4 ACC.
Gold Obi with 1 INT, 2 MND, and 2 Pet ACC.
Sarcatent Cape with MP, MND and 2 Pet Magic ACC.
Silver belt with ACC+2, Range ACC+2, AGI, and DEX.
Emerald Earring with 3 Range ACC and 4 Evasion.
Topaz Earring with Pet Defense+4 and 3 Defense.
Carapace Harness with 4 ACC,1 Evasion and 2 Subtle Blow.
Some other stuff but those are the ones I actually use.
Fey Weapons
Tried 2 erlking swords, I ended up accepting one with Shield Skill+4,AGI+2 and 42 Base DMG and other one with 41 base dmg, enmity+1, Magic Damage taken -2%.
Erlking Tabar only 1 atm and took 49Base DMG, Ice additional effect+10 and Pet Crit hit+1.
In the end, lots of useable stuff but takes alot of time.