Looking for a book where the plot is basically the main character is the chief's son, he has a romance interest and a antagonist who’s a boy his age likes to bully him.
Fast forward some time and he goes on a rite of passage type journey in his ancestral homelands and gains a berserker type power. He comes home to find his love interest is pronounced "dead" but really she left because she thought he was dead, so he leaves home and joins a mercenary band.
I forgot the rest but by the end of the book series, the main character ends up dying after killing his mortal enemy.
I read this on Kindle, in maybe 2019 - I can’t remember exactly. And I remember in the third book of the series he found the love interest but she ultimately got killed by the antagonist after he stormed a castle.
The protagonist killed a bunch of people and earned a nickname for it. When he berserks, he kind of just gets bloodlust and loses control of who’s friend or foe and kills indiscriminately.
The protagonist also seems to been European or his people are based off of European culture.
