Darkest Dungeon is a game where your characters die permanently. It takes time and resources to train up another character when you lose a Legend hero in the Darkest Dungeon or just to random stuff in a Champion-level dungeon, and the entire core gameplay concept is based around a rogue-lite model. The game saves automatically, and unless you manually back up your own file, you cannot undo any of your decisions. The reason bosses in Darkest Dungeon do not have cheap one-shot skills is because it would completely ruin the experience.
Black Souls punishes you for dying with a one-time semi-permanent debuff to your maximum HP that doesn't reapply itself if you die multiple times in a row, but it also rewards you by giving you an item that boosts all your stats. You lose nothing as long as you can get back to your death location to pick up your dropped souls. You can save any time you want, barring very specific circumstances (middle of a cutscene, dating Prickett, Chaos Dungeon, etc.) Death is an important part of the game, including its lore. You are expected to die multiple times and use each as a learning/growing experience.
So? Okay, you need longer to get a lost hero back your point? Tell me what does anybody learn from a boss that has a skill that oneshots you? Besides cursing the devs name and being frustrating? I mean there really is no way to counter that either and all ways that do "handle" that sort of thing just artificially prolong the battle for no reason. Making the whole battle just a slug race.
Deep sea knight for example. This whole battle for me was:
Grit, Critical strike, Grit, Critical strike, Grit, Critical strike, Grit, Critical strike, Grit, Critical strike, Grit, Critical strike....
until he died. With the Margaret Pledge so I had two turns. Oh and MASSES of items.
Not even Dark souls the game this is based of has any Bosses that oneshot you. Or at the very least none that is easily dodged. The black knight with his huge blue sword comes to mind.
