Damage that would take you below 35% health or taken while you are at 35% health is reduced by X%. This effect cannot occur more often than once every 15 sec and cannot be triggered by damage which deals less than 5% of your health.
Will of the Necropolis is a Death knight talent located in the 9th tier of the Blood Tree.
Rank table
Rank
% Damage Reduction
1
5
2
10
3
15
Patch changes
Patch 3.3.3 (2010-03-23): There is no longer a cooldown on the frequency at which this talent can be activated. In addition, this ability can now also be triggered by damage which deals less than 5% of your health.
Patch 3.0.8 (2009-01-20): Now reduces the damage of any attack that takes the DK below 35% health by 5 /10/15% instead of boosting armor when wounded.
Patch 3.3.3 (2010-03-23): There is no longer a cooldown on the frequency at which this talent can be activated. In addition, this ability can now also be triggered by damage which deals less than 5% of your health. 
