One-Shot Players As Shadow Priest (Patreon)
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This is an older exploit that seems to have been rebooted, For this to work you will need access to a low-level mob where legacy damage scales up.
Simply take the psychic link talent, cast vampiric touch on your player target and then cast any direct damage spell on a low-level mob (not a critter) . This should do very high damage and for geared players will usually kill the enemy player outright.
Veteran players will remember this is an older exploit that was fixed for some time and has for unknown reasons been rolled back in the most recent patch. There are other similar exploits which have also been rolled back and I'm compiling a guide on these currently.
Worth mentioning that priests generally have more currently active viable exploits than any class I can ever remember in any expansion. Players who main a priest would benefit from looking through the archives here.