Drain Vitality (Dawnguard)

Drain Vitality is a Dragon Shout in. This shout is used by both Legendary Dragons and Revered Dragons. Gormlaith Golden-Hilt prefers to use this shout instead of Disarm or Unrelenting Force once Dawnguard is installed.

Word locations
The first word is found in the course of the Dawnguard campaign in Dimhollow Crypt, during the quest "Awakening". Another word can be found in the Forgotten Vale, on an island in the middle of a frozen lake east of the world map indicator guarded by the twin dragons Naaslaarum and Voslaarum. Another word can be found at Arcwind Point to the left of the altar

Effects
1 Word: 5 points of damage to stamina for 30s, stagger effect of 0.8

2 Words: 5 points of damage to stamina and magicka for 30s, stagger effect of 0.8

3 Words: 5 points of damage to stamina, magicka and health for 30s, stagger effect of 0.8

This shout does not absorb those values; it only causes damage. IT is unknown if this is a bug or was intentionally done by the developers.

Bugs

 * If you have at least 1 word of both the Drain Vitality and Marked For Death shouts known, a second version of the former using the same words as Marked For Death will appear in the shout menu and will be usable, with all the words having a cooldown of 12. Its description will say "Drains 1 points of Health per second for 20 seconds. Drains 1 point of Magicka per second for 20 seconds. Drains 1 points of Stamina per second for 20 seconds." Spending a soul on Marked For Death also counts as using it on said copy, since they use the same words, and each time you learn a new word for Marked for Death you learn it for this alternate version as well. This version might also have been a single shout that ended up being split into the Marked For Death and Drain Vitality. (for unknown reasons you do not have to have 1 word of Drain Vitality for this bug to occur.)
 * Solution: Use the console command