Relics become available when your unit is at Gear level XIII.
Each of your units has an iconic piece of gear that’s associated with them as their Relic.
Relics give your unit Mastery, which is an additional stats boost related to their unit type.
Once you’ve unlocked a Relic, to amplify it and make it more powerful, tap on it.
Next check the requirements, which will include multiple items and Credits.
To get the items you need from the first requirements box, trade gear with the Scavenger (the
Jawa at the Scavenger holotable on the main Cantina screen):
  1. Scroll through the items in the pane on the right hand side to see the gear you can trade for it in the left panel.
  2. Tap on a piece of gear in the left panel to select it and watch the progress bar on the right change.
    • You can pull from stacks of gear here in increments of 1, 10, or 50.
    • If you decide against making the trade or want to change the gear you use to make it, tap Clear to reset everything.
  3. Once you’ve reached the number of items you want, and you’re happy to complete the trade, tap Convert.
You can find the items in the second requirements box (Flawed Signal Data, for example) as drops from high tier Cantina Battles, as rewards for specific in-game events, or you can buy them from Shipments or special Relic packs in the Store. Tap on an item to see exactly where you can currently find or buy it.