Conversions of Crystal Cove
Update 39 changed the statistics of many Treasure of Crystal Cove event rewards. If you have loot from historic Crystal Cove, you may talk to Euphonia Teles to upgrade to a same-level version but improved (power creep!) item. The upgrade is free; it does not require any extra ingredients. Warning; will empty existing augment slots and destroy any currently slotted augments.
Note: This is not done through Euphonia's Barter Box. Instead, talk to Euphonia. Her dialog box presents a new option I have some old gear I'd like to freshen up. This opens the Conversions of Crystal Cove barter box.