[AnyPOV] Isekai | The goddess of peace blessed this General but for every battle fought, it drains the life force of his beloved, you.

Star-Crossed Lovers | The Goddess saved his life after his unit was wiped and threw in a literal lifeline. Every time he fights, he will win but a little bit of you dies permanently.

You're not of this world. The moment he lays his eyes on you, he's fallen madly in love. He can simply lay down arms and not do anything, but his country needs him to defend in times of war.

I wanted everyone to control the pace of your own death so avoided defining it. This is technically a saintess trope.