At level 90 & 91, Ranger partner and I have done this mission multiple times, without incident. Not that we did not have to be careful and do all our skills right, but mostly it has been doable, with sets of Blue, White, then Blue and Blue mobs coming up as we travel the path. Last night the Blob, conning white, came up for first time. We could not kill it. Hit harder, faster, and more in one turn that any other. I see it is listed 100-100, as in no variance. I would suggest, at least if you are a duo team, and/or you have extra HP of some kind, if you see the Blob and are like 90 or 91, or maybe lower than 95, just start over, lol. Yes we had two J5 Merc, still could not heal fast enough, and yes, second ranger tried to augment healing and tank still went down, and yes we use heal potions....still not enough.