I've been trying for weeks to get this exotic, I feel like it is the only exotic properly geared towards my Sunsinger currently in game, seeing as I typically use Fusion Grenades meaning I will not benefit from Sunbreakers.
However, Xur has not sold it once, instead repeatedly selling mostly Voidfang Vestments and Sunbreakers.
Meanwhile, I have been unsuccessful in acquiring it from raids and strikes, and believe many other Sunsinger-based warlocks have the same issues.
Vote: Bungie, can Xur please give us the Heart of Praxic Fire this week? :)
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Xur needs to just sell everything and quit this nerve racking shit. He can still be a weekend only thing to give us those "Christmas morning willies" since that's important to the community.