Noted for posterity, but no visual proof attached, apologies. Using the set dungeon Vyr outfit from IcyVeins (search icy-veins vyr-set-dungeon-guide) for the AoE benefits, I managed 402 kills at the Act 5 Path-of-the-Drowned Cursed Peat chest. Loaded around 20 or so games looking for no bounty at Act 5 Path-of-the-Drowned, then 5 or 6 of these until the Cursed Peat hill appeared. Between AoE pulsing in Archon mode with the archon disintegrate blazing in a circle with shift key down we got there. Only had to reboot the archon twice. Good luck.
Typhon’s Hydra is also quite good for Curses. You can swap out the cube from Fragment of Destiny to Echoing Fury to hit a higher breakpoint, you don’t need the extra damage from Fragment of Destiny so Echoing Fury will help you clear stuff a little faster and you’ll still one-shot everything on T10. I don’t have a video for Typhon’s, but it’s what I’ve used for it the last few seasons.
I’ve also done it with Twisters. That also works fairly well. Here’s a video back from season 9 before a lot of the twister buffs, it’s even easier now:
In the past I did it with the old Etched Sigil and Blizzard: Apocalypse to cover the area in blizzards. With the Deathwish/Sigil damage buffs Blizzard was strong enough to kill everything on T10 as it spawned. Sadly that doesn’t work anymore after the Etched Sigil change. Here’s a video of a Blizzard clear before the Sigil changes: