Flawless players get an exotic emblem,but that not special enough somehow :/
English
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Crota hard players get many weapons and so do Atheon hard players [spoiler]but let's keep it special for PVE players since lighthouse is to difficult for some [/spoiler]
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Which you also get from ToO,and are better than any other armour sets in the game.Then there's the weapons which aren't clogged up with shank burn.
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The emblem is ugly to be honest, the important thing about flawless is the grimoire card :D