Do you have the advanced skill Massive Criticals?
Massive Criticals has a chance to instantly kill an enemy. When it does trigger an instant death, it does damage equal to the enemies' remaining health. If the enemy was near full health, the damage can show up in the combat log as a ridiculous amount of damage.
See also that you have stealth active, that allow you to land a sneak attack even if is not from behind.
That's some impressive bonus, the max I remember doing reached 300+ with a warrior, and almost the same with a mage.
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