to understand festerblight build thoroughly, we need to know the common output methods of unholy death knight. firstly, you should make sure that the bars of the two sicknesses are not missed. you can use the rune energy when it is about to overflow or use death coil when sudden boom is triggered, so you can stack shadow infusion to trigger dark transformation. scourge strike can be used as support skills then.
the skill priorities of festerblight build is basically the same with traditional builds. the biggest difference is that the dps of festerblight depends on ap a lot. it is difficult to keep the sickness with high ap for reasonable time through using festering strike.
then, how to gain sickness with high ap?
you should have two pieces of ornaments to strengthen your power, so you can have chance to gain sickness with high ap. there is no doubt that some wow gold is needed. in the current edition, bis ornament is the best choice for unholy dk festerblight build. at the beginning of the combat, you can use the buff of unholy strength, potion of mugu power and the two pieces of ornaments to improve power to get the two sicknesses. you can get the most awesome sickness in the whole combat in theory. we need to use festering strike to keep the sickness.
how to maintain sickness and corporate scourge strike and festering strike well?
the core of this build is to use festering strike to last the time of sickness with high ap in the combat. as festering strike need a frost rune and blood rune, and scourge strike takes only one unholy rune, festering strike is better when its damage caused is larger than two scourge strike caused. especially in the later period of the combat, you have to control the lasting time of sickness well. only sickness that can cause damages is good for your dps. or you are losing part of the dps.
the above coins are what you should pay attention to in this build. you need to practice more to get familiar with the details and make the best use of it.