Your Plague Strike, Icy Touch, Chains of Ice, and Outbreak abilities also infect their target with Ebon Plague, which increases damage taken from your diseases by X% and all magic damage taken by an additional 8%.
Ebon Plague is a Death knight talent located in the 6th tier of the Unholy Tree. It causes diseases to apply the Ebon Plague, which increases magic damage in addition to increasing disease damage.
Though this effect is generally useful for synergy with casters in your group, it also improves many of your own abilities including the shadow damage portion of [Scourge Strike], and [Death Coil]. Unlike similar magic damage debuffs, Ebon Plague can be easily spread by [Pestilence].
[Plague Strike], 
[Icy Touch], 
[Chains of Ice], 
[Outbreak]
[Scourge Strike], and 
[Death Coil]. Unlike similar magic damage debuffs, Ebon Plague can be easily spread by 
[Pestilence].
