What is "deathstick"

[Babaizpakla]

I saw people on one croatian server using it, it is not realy named deathstick, but here are some things i know about "deathstick" (in croatian Stap smrti)

It kills you throught full power armor with one shot

Post death message: {Player} was killed by magic

If you have any clues, please tell them.

Using Tekkit, not tekkit lite or classic

[EvilOwl]

This must be an additional mod or a plugin to help the administrators deal with some "players".