The one piece of exotic gear for solar warlocks is not coming in December or any time soon.
Yet the Sunsinger subclass with solar grenades is by far the most popular loadout among all the warlocks I know.
They were underpowered anyway, and need an extra grenade perk, but with the Helium Cycle perk they were the one and only item we had that was specialised for solar warlocks. Void axion warlocks got their Voidfang vestments back, but most locks I know play solar.
But of course I want to spend 7 evenings earning legendary marks just to buy back gear I'd already earned, AND then unlock all the perks again just to get back were I was a year ago.
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The one piece of exotic gear for solar warlocks? Sunsingers have heart of the praxic fire as well. Those are better than sunbreakers.