Had about a dozen Raid attempts, yesterday was the first time I ever completed one. I got Radiant Energy... Probably bullshit, but what's it for?
And which Raid most likely gives the best stuff.
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Radiant energy is used to upgrade weapons from the CE raid. Might be bullshit when you're looking for that sweet rocket launcher or sniper rifle, but you'll be glad to have them when you get your weapons.
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Look at rewards for activity by Hovering over. Look at what materials are needed to upgrade your guns to know which ones require radiant energy