Note: IT ONLY WORKS ON MANGOS SERVERS, NO ANTRIX

You need:
1. Mangos based server(It doesnt works on latest mng revisions.)
2. 70 Level Paladin
3. [Magic Candle] item http://www.wowhead.com/?item=1399
4. Learn specific talents http://www.wowhead.com/?talent=skZEGtIgIdzhqt

Target mob. Use the [Magic candle], it will hit the mob with ~27 dmg, after 1 sec it will hit for -5 (-4) or something like 865403745 dmg sometimes.

Anyway every NPC after recieving a negative damage will DIE!