Gold

What is Gold?
Gold is the premium currency in the game, it multiple uses and can be obtained in multiple ways.

Gold can be obtained from:
 * Real-life money (Shop)
 * Quests
 * Arena (training rounds)
 * Daily Login Rewards
 * Slot Machine
 * Ranking
 * Smelter
 * League Boss

The main usages for gold are:
 * Buying Coffee
 * Buying stuff in the Market
 * Buying Batteries
 * Doing Super Summon in the Fridge (buying the super keys in the Market is more priceworthy)