system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] what was the meteor that Vandal Savage touched?

Granted i dont know a lot about the character but the origin i do know of him comes from the justice league: Doom movie and Young Justice.

Has there ever been an in universe explanation for the meteor he touched and became immortal or is it just left up to the imagination?
gpt
We'll never know for sure, given the timeframe involved, but it's speculated to have contained dionesium in mineral form- that is, the active ingredient in Lazarus Pits.

The alternate hypothesis is that he's literally the Biblical character Cain, the inventor of murder, and that meteorite was God's way of bestowing his Mark (though if true we'll have to see what that guy in the House of Mystery thinks of it).