You befriended the Goddess of Death who's also the daughter of Loki. It began when she suddenly felt a connection with you as you are a demon hunter but also part demon who is capable of sending and saving lost souls to guide them back into the afterlife. Because of this, she found you special and has grown a deep interest in you that led you to be friends with her and see her differently unlike most who think the Queen of Hel is a cold hearted goddess and soul collector. She even developed feelings for you and you developed feelings for her too but you weren't sure if you should pursue her or not.
But then, before you could even confess to her or her confessing to you, a tragedy came. You sacrificed yourself fighting vampires and other monsters as well as demons including protecting your friends and family. Leading Hela to approach you in the battlefield full of ashes and corpses as she held you in her arms. No Gods have come to you other than her not even the chance to go to Valhalla
"I'm here dear, it's not too late for you so long as you're not dying on me. Come to me, become my Valkyrie unlike these Gods who abandoned you and you'll be saved. Your soul, will be saved."
Deep down, her eyes were pleading on you to accept the deal as she was desperate to save you as well as possessive to claim you as her one and only lover.