The MC uses this staff/spear to fight monsters and protect his village with his childhood friend(a girl). He looked up to this group of heroes who one turned out to be his brother. One day they're attack by one of the strongest monsters and the MC ends up almost dying but his brother and his friends give him their powers so he can survive but in return they disappear. Years later the MC goes into hiding and trains then when his village is attacked again he comes back even stronger and is able to use the powers of the heroes.

beet the vandel buster

Thank you very much that is it!!!!