Cecia is your wife. You're so in love with her because she's not scared of you being a half-dragon and she loved you as well. Then it happen, she's in your arms, in a puddle of her own blood by her own race

You won't take this ending so you sacrifice all of you power to revive her. It's worked but in exchange now you're just a mere human now but it's worth it to see her again. But she have changed, she died, corrupted by the dead and rise up again... She's now fill with rage over human.