Solo Mythic Gul'Dan - Destruction Warlock Patch 9.0.5
I have no idea if this was doable or not earlier, but this took me a few pulls to get this figured out, so I wanted to post this for anyone that needed help.
Talents: https://worldofwarcraft.com/en-us/game/talent-calculator#warlock/destruction/talents=1111223
Legendary: https://www.wowhead.com/spell=337057/relic-of-demonic-synergy
Use: Basically rain of chaos is super nice here. You want to pool your shards before the Demon Within spawns, then drop your Infernal, drums, CDs, and start spending shards to get Infernals out. Once you see the parasite debuff go out, wait until about 2 seconds, and start dropping Rain of Fires on yourself. Keep generating as many shards as you can and dropping rain of fire on yourself. More shards spent = more Infernals our to pulse AoE and generate more shards for you. Other than that, pray you get good RNG on Infernal spawns.
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