Monday, May 14, 2012  Runes and Runic Power- The Feedback Loop
Death Knights have the most complicated resource system in World
of Warcraft.  This is not a debate. This is a statement of
easily verifiable fact. Death Knights have Blood Runes, Frost
Runes, Unholy Runes, Death Runes, and Runic Power. All of these
 resources are linked together in a complex relationship that is
very counter-intuitive.  First- your runes. Most abilities at a
Death Knight's disposal consume runes. We have 2 slots for Blood
Runes, 2 slots for Frost Runes, and 2 Slots for Unholy Runes.
The only exception to this rule are Frost Death Knights who have
their 2 Blood Runes replaced by 2 permanent Death Runes. 
[Picture from TenTonHammer]  Now, spending each of these runes
instantly begins a regeneration of the now empty slot. However,
each of the runes of a pair cannot regenerate simultaneously-
they must regenerate one at a time. So regenerating two Frost
runes works like this: Frost rune #1 regenerates over a specific
period of time