I've been testing my pack which includes a number of mods discussed here in this thread, and I've noticed a few small issues along the way. Most of them I could figure out (Troubleshoot mod conflicts, Minetweak conflicting recipes, google random bits) but I encountered something my limited searching has provided no answer to, so I figure I'd see if you guys had seen it.
I encountered a bandit camp for the first time today. It was early game, so it was a major fight (just me vs the whole camp at once). Once the mooks were dead, it was just me and the Bandit Leader. No matter what I try, I cannot harm the Bandit Leader (I've not doused him in lava, but I may, just to see what happens). When I hit him, particle effects cover him, but I'm not sure what they are doing for him.
Since it was early game, I decided to fight smarter not harder. I used Punji Sticks (TiCo) to damage the majority of the soldiers on approach to me, and a few may have been killed by them. All other damage was done with either a TiCo Flint Hatchet or one of their own Iron Swords. Doubt any of that will make a difference, but information is good, right?