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OK, so we know that Endymion was killed, resulting in Serenity basically going supernova, but who killed Endymion? We do know that it was someone who was trying to go after Serenity, and therefore was probably from Earth.

Theories I've come up with:
A) A random nobody. I don't like this theory, because it sucks.

B) Beryl. She was the one that did it in the manga, but for some reason I can't see her wielding a sword in PGSM.

C) Kunzite. He was the only character in the show that carried a sword and was still alive at that point. I also really like this theory, because Kunzite blamed Endymion for the Earth being destroyed. If this theory is true, it was in fact Kunzite's fault.

Screenshot of the scene

Other thoughts and theories?

xd

Oh! Maybe Kunzite caught Zoisite in bed with Serenity and Endymion and got peed and killed Endymion for not inviting him?

But what Zah said makes sense tho. We saw Kunzite with a sword in his hand and was the last one living when he had those flash backs. Maybe he was trying to kill Serenity and Endymion jumped in front of the blade to protect her and Serenity got psycho and use the crystal to destroy everything. Near the last act when Jadeite tried to kill Endymion, Kunzite jumped in front of the blade to protect Endymion. Could he possibly did the same thing that Endymion did to Serenity in the past?

Global warming? Yeah, it kills everything. I wouldn't be surprised if Serenity unleashed global warming onto the world with the Ginzuishou.