Disclaimer: If I owned Sailor Moon, then Chibi-Usa would've never appeared in the show, or at least not as the daughter of Usagi and Mamoru nor would she be from the 30th century. In fact, there would be no time travel whatsoever.
I glared at the red-haired Earthling, the one who had supposedly been a friend of Endymion's. I think her name was Beryl. It didn't matter. Every part of my being shook with rage. "You... you monster! What you have done is unforgivable, killing Endymion like that!" I picked up the sword of my beloved and held it in my hand, beginning to say a short prayer that I would be victorious. "I'm going to punish you. In the name of the moon, prepare to die." Without another word, I lunged at her, piercing her through the abdomen with his sword. She would pay. They would all pay for this. Laughing, I ran towards them, swinging his sword at all who dared to come near me.
A day later, I stared at the ocean from one of Earth's beaches, finding it hard to keep from crying. I didn't want this place and its memories to be washed in blood. This was the place where Endymion and I first held hands. The Moon Kingdom had been all but destroyed. So had the creature who called herself Metalia.
"Serenity," Sailor Mars said. Out of my four guardians, only she was left. Jupiter had sacrificed herself in helping my mother, my dear now-dead mother, seal away Metalia. Venus had died by the hand of Kunzite. And Mercury... Mercury was dead because of me.
I noticed how Mars's skirt was red like blood. So much blood had been spilled because of me. All of Earth's oceans couldn't wash that blood from my hands. I grinned as I realized that I didn't care. I would re-spill all that and more just to get Endymion back to me.