All death knights can learn to exude a dark, raging battle aura that causes allied creatures around them to move and regenerate life more quickly.WC3Man 38
Patch 3.1.0 (2009-04-14): Replaced with Improved Unholy Presence. Allows the Deathknight to keep the movement speed bonus of Unholy Presence in any presence, and increases rune regeneration rate while in Unholy Presence.