Also for anyone who thinks upgrading it to 365 atk will make it better it won't it really, really won't lol. I promise you it will still only be effective against lower tier enemies of course unless there's a solar burn nightfall then its a bit better. It will also not be so bad when the primary weapon damage increase modifier is on in the prison of elders but outside of that it will be disappointing.
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Primary burn doesn't effect Mythoclast. It counts as a secondary weapon.