ShPD: What are your favourite and least favourite challenges?

I personally think each of the challenges are well thought out!

Favourites: Badder Bosses and Swarm Intelligence. These imho add a nice layer to the game.

Least favourite: Into the darkness, it annoys me getting sniped from a ranged enemy without seeing anything.

Special shout-out to pharmacopoeia and faith is my armour. I cannot finish the game with these on - anyone got any tips?