I agree, I just reworked the skill above and added some new math, let me know what you think. Enmity on this skill gives DRK a steady influx of threat to keep it on par with WARs and PLDs threat building ability
DRK suffers the most from DPS downtime, to aid in its uptime I wanted to give the DRK knight something unique, and it is the only tank without an anti-knockback ability. I don't think the 60sec CD is a problem, since Surecast is on a 30s cooldown.
I understand your point. However, I made this decision because Shadow Wall is 30% for 10s on a 3 min recast, Sentinel is 40% same duration and recast, and Vengeance is 30% +55 potency physical dmg counter for 15s on a 2 min recast. DRK also has the least amount of fluff mitigation cooldowns, and would benefit the most from dropping awareness in some fights in exchange for a different role skill (like convalescence, to aid healers when using Living Dead)
This is one skill that I would feel comfortable leaving alone however.
I did this for 2 reasons, to help balance out the buffs in other places and to reduce the dps costs of holding it for use as a gap closer.
I understand the concern about Crits/DH, however, there are 3 chances for at least 1 hit to Crit/DH, I think this change would relatively balance out with itself in that regard say your chance to Crit/DH was 15%, over the course of a 12 min fight thats 12 CnS uses, you will Crit/DH (1.8) 1-2 times. Now if it was broken up thats 12 uses and 36 hits/chances to Crit/DH, you will Crit/DH (5.4) 5-6 times. Since the potency is divided into 3 hits, this equates to 1.7-2 original CnS Crit/DH. My adjustment can account for fractional potencies of the original, but I'd say its relatively the same overall.
I'd like to point out that the Blood Gained here is for a DA version of my CnS, which has the same MP cost as current DRK passenger, so really you are just trading a DA for 50 blood, similar to TBN, but without the added benefit of a shield. This would be a potency loss or gain depending on when/how it was used, just like TBN. This would mainly be used to proc delirium when you are unsure if TBN break.