No offense, but don't listen to this post, it's woefully inaccurate. Read my post above, you need to keep all resources on cooldown, so you don't use the same runes twice opening up, you use all of them once. Then start on priority, you also don't just use death coils when your other abilities are on CD, you use it whenever you are about to be RP capped and/or have a free one and/or don't have a runic corruption proc. Proccing runic corruption is the most important thing as an unholy dk, so it should have the most uptime as is possible, which translates into using death coil as soon as runic corruption wears off, followed by another attack based on what runes you have the most of, then if you still don't have runic corruption from the death coil, use another death coil, that's how it is supposed to be done. In 4.0.6, unless they changed it back, subsequent runic corruption procs will extend its duration rather than overlapping and 'wasting' the procs, for that reason, DC will be used a LOT more, if you look at the meters after a boss fight, death coil is a major contributor, it shouldnt be your 'i have nothing else to do' button, that button is called Horn of Winter.