Originally posted by DarthAnt66
The Underlurker (pre-nerf) was probably the hardest SM boss, but overall TFB always seemed a more difficult operation as a whole.
The Underlurker was hard because it was broken, not because it was hard. The hardest Story Mode op boss was Warlord Kephess back in the day, but that whole op was nerfed to hell.
Nowadays none of the operations are hard enough on SM/HM to even justify the title of "hardest", lmao.