So, I have around 80+ hours in the game so far, having a blast, and something I have noticed is that fall damage is very weird.
I used to think it was just like Minecraft where 4 blocks of height is around where fall damage starts. However, the more I played the more confused I grew. I once jumped off, by accident, from over 10 blocks of height and took 0 damage, not even a sound from my character. But now, I am building and every time I walk off the walls (4 blocks of height) my guy starts whining despite only taking 0.1 hp of damage.
To add more context, sometimes I jump from 5 blocks of height and take a quarter of my HP in damage and sometimes i jump from the same height or more and took none to very little damage.
How does it work? Armour doesn't seem to affect it. besides, I hardly am actively wearing armour when travelling or building. I only put in on when I suspect trouble.