The entire Northlands are mainly made of ice.
The basis of the entire ecosystem is a type of moss that can grow on the ice under the snow, which certain types of cattle can eat, but is agonizingly poisonous for humans to eat.
Months of night and months of day.
It has(Possibly) Wendigos- warriors who fell into cannibalism for fun and are now cursed- roaming the country sides.
Strange mutated beasts that were once men.
Raiders of everyone else's clan trying to raid everyone.
Only five major cities.
Cultists of Samhain roaming the country-side looking for enemies of Samhain and victims to torture and then cut the hearts out to feed to the god that make the demons of the south look tame.
Constant wars, any empire that rises falls so soon that people no longer try to keep track of how many empires existed.
There is no heaven that people believe in, just everlasting torture at the hands of Samhain, or if they were weak, sinful or stupid in life, worse fates that other less kind gods reap upon them. The only thing they have to look foward to is when the world ends, and every man and woman who ever fought anything fight in a last battle to save Itu, so they can finally rest in peace.
Basically its a hellhole covered in razorblades and barbwire.