Upgrade material, specific to each weapon, armour and gear is used (along with coins) for upgrading equipment. Rainbow material can be used to upgrade any piece of equipment.
Obtained from:
In Runs:
- Kills in Campaign (x2), Tournament (x2), Gun Dungeons (x1) and Castles (x1), improved by Crafter perk
- Hidden Treasures
- Jackbot’s Jackpot
- From the Merchant, small quantities for coins, larger quantities for gems
- One time completion rewards in Gun Dungeons
Outside Runs:
- Metal (including Rare) and Gold Crates
- Scrapping unwanted equipment (details)
Note: Please let me know if I’ve missed any uses / earning options