The First Binding by R R Virdi

All legends are born of truths. And just as much lies. These are mine. Judge me for what you will. But you will hear my story first.
I buried the village of Ampur under a mountain of ice and snow. Then I killed their god. I've stolen old magics and been cursed for it. I started a war with those that walked before mankind and lost the princess I loved, and wanted to save. I've called lightning and bound fire. I am legend. And I am a monster.
My name is Ari.
And this is the story of how I let loose the first evil.