Hexos was a bitch for me, because I pretty much couldn't use stampede because it'd get me killed everytime due to lag. For me personally if I could get past the first 15 seconds I was golden. Out of my 20+ wipes on him probably 15 were actually around 90%. Once my lag died down the fight was, while still challenging, alot easier. Hexos is probably the second hardest boss in Brawler's Guild other than Disruptron. All the bosses in Rank 8 are a walk through after him, but Rank 9 has overall pretty challenging bosses other than Dr. Fist or w/e his name is.