This site offers a nice quick run down on the lore behind destiny . It basically puts some of the most important parts of the Grimoire in order , so you can get a good grasp of what the story should have been like .
http://www.destinytimeline.com
Not my site by the way, but thought it was pretty cool .
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#Destiny
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Something on the dreg grimore is they had four arms but they were cut off during training they determine strength and skill and the weaker ones dregs had theyre bottom arms chop chop chopped off