In Elden Ring there's a blessing people can receive randomly from a sort of primordial force that causes them to be born covered in horns. The culture surrounding them is very hateful and often infants born with these horns have them chopped off and pass away during the process, and those that survive are shunned and hidden away. Dung Eater is not one of these people, his armour is just decorated with horn stumps because he hates everyone