We either need scaling HP based on fireteam size, or the HP pools need to come down. This isn't a challenge, it's a pain; difficulty comes from the length of time one has to spend in the room which comes with an inherent threat of dying at any moment but asking for solo players to spend upwards of an hour or more whittling away one boss and hundreds upon hundreds of enemies is just excessive and exhausting. Spire was bad enough, this continues a very bad trend of dungeon bosses being tankier than everything in the game for really no good reason, especially when this particular dungeon has more mechanics than Root of Nightmares AND the boss is tougher than Nezerac.