Best Sunsinger exotic, especially if you don't wimp out and only use your Super when you die.
Radiance with fusion grenades is the best orb generator and best single-target damaging Super out there by a long shot (assuming you don't reserve your Super for just when you die).
HoPF basically doubles its damage output on top of that.
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Actually, it adds one third (from 8 grenades to 12) and I do generally wimp out with my super in Nightfalls.
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Even 4 extra fusion grenades is nearly 10k more damage. Offensive Sunsinger can be a lot of fun once you step outside your Fireborn comfort zone. Orbs for days, and a lot more damage than you'd think.