Do Unholy DK's provide any raid buffs other then HoW that all dk specs provide?

[Superty44]

I've asked a couple people but can't seem to get the correct answer, I know FDK's provide improved Icy talons for the haste and BDK's provide Abomination's Might for the extra AP. But what do Unholy's provide? I know their AoE dps is pretty significant and most 25 runs ask for at least 1 - 2 DK's one of which being an Unholy. So my question is what do they provide as far raid buffs go?

[Aristocat]

Look up their Ebon Plaguebringer talent.

[anovakm]

In 10 they are pretty useful coz they provide 13% more spell dmg on target.

[angrylol]

Boomkins and warlocks provide same debuff. Greatest boon is that unholy spreads it to all targets, that's the unique thing. 30% disease damage bonus on target is nice too, but minor.

[GearkingXAW]

In 10 they are pretty useful coz they provide 13% more spell dmg on target.

Your forgetting the 30% increase in disease dmg from Crypt Fever.