We run level 10’s regularly without a single Darfari. I have 2 Janos, 1 Lian, 2 Kistis, 1 Berserker (That’s 8 fighters), and 8 archers using Star Metal, Obsidian, Black Ice, and Gas Arrows.
Since I rebuilt the entrance, zero lost thralls and I rarely leave the platform spilling flaming tar. Yes, I do delete the non-essential thralls. I keep Anja the Dervish, Cormag, and Sonja, but not much else.