Easiest skill to upgrade would probably be Intellectual, where they literally just need to sit there researching all day. Others would include tasks like crafting and growing, where you can just have them automated to preform certain tasks over and over throughout the day.
The hardest skill I've noted to increase is Melee.
Unless you start with a high melee stat to begin with, it's not going to be a fun time increasing it. Unlike other automated tasks, increasing Melee is a more demanding grind with a lot more risks involved like injuries and death.
The hardest skill I've noted to increase is Melee.
Unless you start with a high melee stat to begin with, it's not going to be a fun time increasing it. Unlike other automated tasks, increasing Melee is a more demanding grind with a lot more risks involved like injuries and death.