Anyone who can actually give me the statistical probability for getting a Legendary Item out of a Rare Engram and can defend why having the probability being that low makes sense wins one cookie.
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The defense isn't the statistic of getting legendaries from it but the fact that it levels your cryptarch which gives you opportunity for a legendary ingram and the always possible and decent chance of getting motes of light and strange coins which buy exotics. They also help low levels get easy light if they can't get legendaries yet