Exactly like this!! I had tried enormous times, problem was always my DPS… I had shadowlands mythic gear… i did one change => got my 50 ilvl heirloom weapon with Crusader enchant just like this person mentioned… and ow my wasn’t it a beauty => second time got the achievement… I did lots and lots of tries with shadowlands gear and never got it even near (max was 24% on Sigrym but like + 6minutes which was really hard to keep up with all the mechanics)… with that heirloom + enchant it did the trick!!
THANK YOU Aerodan you made my day
For whomever is questioning the talents and so on, I had:
Zeal
Empyrean Power
Repentance
Cavalier
Divine Purpose (for the extra ‘i did a mistake and need heals NOW’ cases + extra TVs on the shield phases)
Healing Hands
Final Reckoning
Got all the consumables i could just like Aerodan mentioned.
Only used Repentance to stop Blood of the Father casts, and as soon as it stopped i was back to cleaving all 3 of them. I kept on interrupting the spellcaster always as long as i knew a shield was not comming in the near 20secs future (used DBM for this of course)… so the caster was always always around me to be able to cleave all 3 at the same time.
Also used the macros, had already saw it in the wowhead guide comment so I stole all of them hehe (interrupt on Sear, rep on sig, hammer and slow on jarl)
Regarding the fight itself, I did as the following: start with SoV, then judgement on Sig, interrupt runesear and jump on jarl with wings and FR and all that I could, including drums (got him to 75% right before enrage).
Then when jarl started enrage, I stunned him, interrupted runsear and run to the middle while divine storming the 2 of them (sig and runesear) and when hammer was out I did HoH on jarl so he would not get to me before the runes popped.
Every time the runes popped i tried to put all 3 on me (so I could cleave while running) and started running to the runes, if they were near me, I didn’t use Divine Steed, if they were not, then I used it. Also some times I started on not using, but then blood of the father would come in, I had to stop running to cast repentance and then had to use the horse to get to the last rune before exploding…
DBM helped a lot, I was always checking the bars to know when the shield or Blood of the father was coming. I was sometimes lucky with the valkyrs, sometimes had to use divine steed to get to the place… like Aerodan mentioned, a lot of lucky stuff there really…
As last note, I did this on legion as well on my Ret (this character) and i felt that until i got this heirloom + enchant tip, in legion was way easier… i did on my 20 try at the time and i just had normal mythic+ gear…But in legion having Syg CCed was way better than now…
So for whomever is still trying, you can do it just cleave all 3, always interrupt runesear to be always with you and have fun
At the end of the day you get lucky, runes spawn in the right place, valkysr spot to be is where you are already and Jarl is dead and you do it