Yes, it is simply RNG. You could also defeat Kalli in the Last Wish raid or visit Mara's Court during the full curse week for a guaranteed Seed of Light.
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Aww man... stuff like this shouldnt be tied to rng
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But you can easily get it from maras courtroom on full curse weeks.
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I know but the intent was to get the well of radiance super so I can easily create orbs for the iron banner bounty
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Oh I see. What’s the bounty?
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I believe its called Shine On and it requires you to create 50 orbs during Iron Banner matches
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Chaos reach generates a few orbs per kill. You can also masterwork a rocket/grenade launcher, so that you can get orbs when you get multi kills. But yes, you can get seeds of light from blind well. Heroic only I believe.