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UC (Universal Credits?) is StarBreak's premium currency, used to buy cosmetics and quality-of-life features.
UC can be obtained in 2 ways - leveling up, and from the Star Cathedral. Leveling up gives 10 UC, and clearing mobs or bosses in the Star Cathedral also can give UC
UC is used to buy additional item storage chests (40 UC each), shell storage vats (95 UC each), and temporary hats (5 UC each) which are lost on shell death. The first two items are located in your home, while the last item can be obtained from the Hat Shop in Eschaton.