Probably the last kills before Emerald Nightmare releases: Heroic Highmaul 4/7
Nothing of note much - the strategies are all the same from normal.
Also, at long last:
849, 1.7% Leech, all consumables.
It's honestly not worth the hassle since it'll be much easier when EN comes out. Use ST trinkets - Mythic Horn is obviously the best choice, but if not any of the other ST direct damage ones can work too, although I would not recommend the EoA mastery trinket, Infernal Writ or Moonlight Prism - you'd either need to delay your burst (and frankly you don't have the time to delay your burst) or your trinkets will simply be nonentities during your burst, and the fight is all about doing 16M damage during your Combustion.
Also, pull from max range. At least in my case, he walked over rather than hooked me in. It's a few more precious seconds you're not getting cleaved or pummeled.