0.34 had added special weapon brands which are unique to each weapon brand. Mostly they are great, except for the maces-exclusive brand, concussion.
In a game where positioning is god and moving towards your enemies is a skill issue most of the time, concussion just makes zero sense. I assumed you could at least prevent the movement by attacking with shift+direction (the way it works with the new centaur-thingie) but no!
Getting concussion as your only brand is even worse than getting chaos in the same circumstances… Because at least chaos is really strong!