Yeah, it blames other player's &or their mercs.
Mine said "Unknown Killer"
With my friend he was under the world boss so we didn't know what it was.
We assumed the meteor but it was hard to tell.
With mine, I was isolated from the action and it just came down and wiped me.
No DOT or tick damage... just dead.
Then a few seconds later, another player got wiped the same way.
To get around it, I do world bosses alone or with friends.
If a lot of strangers are there, I sit back with my fortress ready.
Nowadays, just to survive it, I just spin around the outer edges. Good to know it's the meteors and a bug.
Best of luck in HC man. I hope you survive!