I will deal with Daimon once I get to him but as for Death? Magick Archers can easily destroy him and farm him in the Sewer and yes that includes Magick Archers with a Balanced Build here someone showing how to do it on a 401/515 Build: https://www.youtube.com/watch?v=HD8QWMUySiQOn character builds, balanced ones are not the way forwards, at least that's what I've found. You want your main attack stat to be close to 800 once your character has leveled all the way to 200. High level enemies like Death, Daimon and high level dragon's have got high damage resistance thresholds a balanced character with 500 attack and 500 magic attack will go above those barriers by less meaning your character will do less damage overall.
And at least versus Death in this scenario a Min/Max Build (Take Sorcerer all the way to Lv.200) didn't make a significant difference at all: https://www.youtube.com/watch?v=1rm2RulJf8w
I wasn't going to min/max because I hate playing as the Sorcerer so much I actually just finished grinding out all of my needed vocations for my build today by farming the Wight near The Great Wall so now I'm Lv.86 I'm happily playing as a Magick Archer and I'm barely at Stage 2 (Hard Mode) in the story so I have to wonder what my Lv. will be once I actually decide to start Bitter Black Isle