Destiny allow us to upgrade the mythoclast to 331, the same as all other exotics. This gun took many hours to receive we should at least be allowed to upgrade it to the same attack damage as the rest of the weapons post dlc.
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They should just add a special item that drops from VoG bosses and can be used to re-roll your VoG weapon to 331 but the only way it can be re-rolled is to have it at 300. Something like the runed core or something