Blood Boil
I think more people than me don't like the way Blood Boil works right now.
As it is right now, it deals up to 2k each target, at the cost of one Blood rune, that doesn't turn into a Death Rune like pestilence, or the 4-5k hitting Blood Strike.
And also, listen to it's name. "Blood Boil". I think that if your blood really boiled, you would feel more than just a jolt of pain, like it is now.
My suggestions is:
1) Give it a runic power cost. If it costed 40 RP, and with a little increased damage this could be good for AoE.
2) Make it a DoT. I'd give it a ~20 second cooldown, and added a DoT to it, perhaps that reduces over time, as the blood cools down.
Unholy Blight
Maybe it works fine in arenas, but I'd love if it became useful in PvE, more than maximum 1% of total damage.
My suggestions for Unholy Blight is:
1) Let it stack. Getting a 10k DC crit followed by a 6k hit makes hit hit for 60 dmg each sec, but if they stacked it would be 160 instead, which is a considerable amount, compared.
2) Instead of dealing damage based on DC, make it increase Disease Damage. "Your Death Coils also increase the damage done by diseases by x% for 10 seconds. Eventually, make this stack too, or base the % on how much damage the Death Coil did.
What do you guys think?