All bossfight are just too cheesy currently, as for poison and the swamp, they really need a rebalance, 90% of my deaths were in the swamp, it's not just poison, the fact that you are always wet, that you have to avoid leeches and hordes of draugrs with bows makes it more unpleasant that it should be, poison resistance mead do make the swamp easier, but it does not negate all the things that will make you struggle. My point is, the swamp is just not fun, and personally i think just getting rid of the permanent rain or adding a wet effect resistance cape or armor would make it much more enjoyable.