Probably easiest spot in the dungeon for a solo camp; If you set up in the dead-end cave that's right by him, he'll come alone when you pull - you do have to watch for one discordling roamer, that parks under the ramp in fromt of that cave for a few mins. The roamer comes as an add when you pull if you're not careful.
Nothing roams in the dead end cave. Infact, nobody never goes there for nothing. You can go watch your favorite TV show while you camp your "Sash of Discordling Flesh" ( I got one here, so he drops it for sure)!