Recently they announced a significant buff to the tanking weapon enchant, Mark of Blackrock. Before the nerf, if could only proc if you were hit while below 50% hp, and even then only had a 30% chance on that hit. Very bad. Now it procs if the hit takes you below 60%, so you could get a proc at any HP if it hits hard enough. It also has a 100% chance instead of a 30% chance. All this means that the uptime of this is going to be MUCH better than before, and 500 Bonus Armor is nothing to sniff at, so this has led to some blood DKs wondering how it compared to our runeforges. I decided to take some time to clarify where Mark of Blackrock stands for blood.
Spoiler alert: Keep using Fallen Crusader.
Going just off the tooltip, Mark sounds amazing, as you could have significant uptime of 500 Bonus Armor. However what’s not written is the 40 second internal cooldown. Here is a link to the blue post (with the old proc status, but the ICD is the same). So given the BEST chance of uptime, you’re still looking at only 30% (12 second duration, 40 second ICD). 30% of 500 is only 150 static bonus armor. Fallen Crusader on the other hand, has no ICD but rather goes off a rppm mechanic like a trinket. With an rppm of 3, with even 0 haste rating (fully buffed) FC is going to have an average of ~58% uptime (this isn’t accounting for the near guaranteed proc at the opening, so it’s potentially much lower than reality depending on length) of +20% increased strength, which for me is about 780 strength per proc fully raid buffed. 780 str on a 58% uptime translates to 452 strength averaged out.
This is before you even consider the fact that if you’re not taking damage enough to reliably proc Mark of Blackrock you don’t get anything. The 30% uptime from earlier was best case scenario, and if you are not tanking anything (tank swap for example) or just tanking something very light hitting, you are going to get 0% uptime until you start taking damage. Let’s say a tank swap had you taking “enough” damage and was a 50/50 split (you tank the boss equally with your co-tank). Your overall uptime of Mark would be 15%, and 15% of 500 armor is a static value of only 75 armor overall, which is not great.