Just did The Master's Test on about my tenth attempt, feeling pretty good about it. I found that bringing enough materials to make a load of farcasters and using those any time I'm bleeding/in trouble/caught with the gate down etc. really made the fight a whole lot easier. So often on my failed attempts I'd smoke bomb, split the monsters up, start working on one and then take a bit of damage, so I'd stop attacking to heal. Then because I had to put some distance between me and the monster, my wystone would run out, then I'd have to keep an eye on the gate, then sharpen my weapon... it was really easy to fall into this cycle of heal, sharpen, heal, smoke, mosswine, gates, heal, wystones, heal and so on until I had no time to actually attack. Farcasters abuse really let me fight that quest on my own terms.