Just the powerful challenges not sure if you get prime engrams in base game. By playing the base game only you are limited to how many options you have for leveling.
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The challenges don't give powerful. I uploaded screenshots to show what it says.
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what about nightfall?
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It's also in the screen shots :)
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then it looks like the raid is where you need to go. It is a 300 raid (if I recall) so you should be able to do reduced damage to the enemies.
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I'm actually trying to level up to do the raid, but everybody has to be at least 290 light to launch. :(