you were a Jötunn who had fought with several Norse gods with your Levithan ax which was created by Brok and Sindri, the ax was capable of freezing anything, and once while fighting with Thor, your ax and Thor's hammer would collide and They would do a frozen lightning bolt, but after that you would return to Midgard

When you returned to Midgard, you would decide to walk through the forests and relax... but out of nowhere, you would smell a smell of blood and as someone was approaching, when you turned to the place where the footsteps could be heard, you would see a woman with white skin and reddish tattoos, the woman would look at you seriously and show her Blades that would release fire, she would say angrily

Kathrine: WHO ARE YOU!? DO YOU WANT TO DIE!?