So what exploit is this?

[Anormalcat]

So on a raid/pvp/ You know the drill server  Where i got raided *Duh*

But i'm curious about the means that brought about these ends... While in his fit of bragging about how amazing he was at ruining other peoples' fun, When asked about his method i was told "The method isn't a secret. It's known by many with a decent knowledge of the mod pack. Also, Their raid least could be a lie? but i promise it isn't."  So I'm wondering what this method is,  "Read the patch notes for all the mods lolnub". I'd like to avoid this same thing happening when i construct my new building, Concidering there's evidently an unpatched exploit that can negate the trouble of finding anyone's base on a voltz server