Patch 5.2.0 (5-Mar-2013): Death Knights now maintain the same health percentage when switching into and out of Blood Presence.
Patch 4.3.0 (29-Nov-2011): Threat generated by classes in active tanking modes has been increased to 500% damage done, up from 300%.; Blood Presence now provides an armor bonus of 55%, up from 30%.
Patch 4.0.6 (8-Feb-2011): The tooltip for Blood Presence was giving an incorrect value and has been corrected.
/Patch 4.0.1 (12-Oct-2010): The effects of Blood Presence and Frost Presence have been exchanged.
Patch 3.0.8 (2009-01-20): Now grants 2/4% instead of 1/2% healing.