at 618 ilvl on aoe dummies i can get about 1.65M burst at the beginning. i switched to manually pressing everything and i got to 1.95M on dummies and 2.5M on a +7 key. so i think there is a limit to the macro. This is the input i got from the DK discord using this macro.
Line up Pillar of Frost and Reaper’s Mark. Macro them together and use it when you’re not on GCD. It’s a big deal.
Use Remorseless Winter going into your Pillar/Reaper’s Mark. You should not need to cast it inside Pillar at all.
You need to use Death and Decay. It’s a cleave fight. Use it directly before EVERY cast of Reaper’s Mark/Pillar of Frost. Then use the second charge during your Enduring Strength.
Use your Transmitter a few seconds before Pillar, then complete the puzzle before you Pillar/RM, ideally right before. If you don’t want to do this, it’s probably not worth running Transmitter and you should farm Skarmorak/Khardros instead. Again, do not cast inside Pillar. You’re better off waiting for the next one.
Use Abomination Limb before combat, and before Pillar windows. Do not cast it inside Pillar.
[6:33 PM]
I think you also need to improve your understanding of what Obliteration actually does for you, the tl;dr being that it gives your non-Obliterates a high chance of giving you Killing Machines that you spend on Obliterates for massive damage. With that in mind, look at this…
You cast Pillar of Frost, but then didn’t use Obliterate for over 10 seconds. You may as well have not used Pillar at all. There are a few reasons this happened:
Didn’t pull Runes hard enough before Pillar came out.
Used Reaper’s Mark way too late, so you didn’t get the benefit of Exterminate reducing your Obliterate costs.
Didn’t Remorseless Winter before Pillar, so you had to waste a Rune on it that you could’ve used on Obliterate otherwise.