Mk IV Weapon Fragments

I see these for sale in the auction house but can not find out how to get them in game
Any help would be appreciated
Cheers

They are found in raid (Manhattan Exclusion Zone) weekly reward chests. Amount depends on difficulty level, and you receive them from Story mode and Elite ones separately, just like distillate/talisman/weapon rewards. Once you have 300 of these fragments, you can double click them to transform them into an imbuer that will turn 3* weapon into 4* weapon, upping the suffix bonus by 33%.

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TYVM
Extremely helpful
Cheers

Unless were talking about alacrity in which case its 10% (20% —> 22%)

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