Basic needs
Most “basic needs” to survive are given a backseat here.
You don’t need to sleep but doing so does help regenerate physical wounds faster and to doubles your natural health and mana regeneration rates.
You don’t need to spend time eating, but still can if you want, though eventually, if you, for instance, spend multiple days (20-40-60 turns) in places where you can’t find food easily like caves, deserts or bodies of waters, you will start to get hungry and will need to go find food unless you want to die of starvation.
You don’t need to drink water, but, like food, if you spend a lot of time somewhere with no water, you will eventually need to go find some or else you will eventually die.
It should be noted that even though you don’t need to clean yourself, you do still get dirty over time, and depending on what you did to get dirty, some people may react poorly to your appearance, so taking a bath from time to time may be a good idea. The same logic also applies to weapons and armor, and as such, cleaning them is recommended.