Just became cavalier!
Cost about 400 units worth of revives. Since I have no reliable bleed immunes, I had to max boost domino 4/55 and keep trying on CB. First 4 quests were easy and cost no units. Last quest was a little bit of a pain because of how tanky sentinel was, but I got him down. Opened 3 cav crystals afterwards and got a 5* blade dupe again, 5* CW, and a 3* BP. Should I spend all the units I earn on cav crystals? They seem like they are worth it for the drop rates