Shadowlance

Her everyone i have ben playing this game for 2 weeks now, and im trying to go deep Down into the infinite dungeon. But im only at floor 78 and starting to get stuck. So the last 2 days i ben farming S rank arkadians and Got 3 S ranked 5 A ranked many B ranked Shadowlances. My question is if i get many of Them Will it make a differens is Shadowlance that good or is it waste of farming and should i go use many many hours ón trying to get more omega,S

It’s especially useful against the bosses, because it has metal slash. But I wouldn’t rely too heavily on it because it’s a death monster and very week to holy. And one of the bosses is holy as well.