Meh, pretty disappointed so far by this third DLC. It's basically a sort of Colosseum of Fools made only with bosses, which are often absurdly enhanced (lol, Uumuu was probably the worst boss of the game, and now it's a pain in the ass) compared to the "vanilla" versions you find during the main game, and sometimes are even quite unbalanced.
The worst thing is that it's organized as a sequence of boss rushes: so, to see the new bosses the developers added (such as the nailmasters), you have to beat again and again and again and [...] the same bosses you have already beaten during the story. And there are absolutely no rewards for the amount of patience and time you spend, apart from % completion rate: no new charms (the "glorified charms" feature was eventually cut by the developers), no upgrades, nothing. You do all of this shit... just to unlock a new ending, which is frankly horrible, and doesn't fit at all with the narrative and the mood of the game.
Hollow Knight was at times an hard experience, but with constancy and will you were always able to eventually pass the difficulties. This DLC, instead, is specifically designed for those hardcore gamers who can beat the game blind in less than 30 seconds, and only for them. It was already clear that Team Cherry wanted to satisfy this (very) small amount of players with the Grimm Troupe DLC (the Nightmare Grimm boss and the Path of Pain were challenging as hell), but this time they exaggerated. And I frankly don't know why.
The base game is one of the most intense and exciting titles I've played in years, but no way I'll play this shit. I thank the developers since it's a free DLC, of course, but this isn't really what I was expecting.
I'll wait for the Hornet DLC.