On warlock/fighter, I like to recommend not heading with Hexblade but alternatively Fiend. The overlap goes away and temp HP for the kills is especially fantastic for melee fighters (as well as better stage skills just like the damage resistance are hardly ever not destined to be valuable). I recommend https://chanceqlctk.dreamyblogs.com/21853978/the-smart-trick-of-dungeons-and-dragons-paladin-that-nobody-is-discussing