# Building Cards

### Opening and Building Factory Cards

System for opening and building factory cards To obtain factory cards, players must buy AI crates directly or trade with other players on the Marketplace. Factory cards participate in battles passively, giving some bonuses on the ground; they summon battle cards that make up the deck to fight on the front line.

After successfully purchasing cards from factories, players will need to decode the AI for it to start producing battle cards. If the factory cards reach the maximum amount of construction, players will need to consume Energy and DATA tokens to be able to maintain and decode more battle cards to be built.

### AI Decoding

Each factory card can only be opened once. The factory card needs to be opened before they can summon Battle Cards. After the player opens the factory card, the system will give him ten unique opportunities to build battle cards.

### Building System&#x20;

Battle cards are randomly generated when players manually perform building with the factory card. Each factory card has two national attributes, primary and secondary. The factory card's national details determine which national battle cards it can build

Each factory card rarity level (Common, Rare, Epic, and Legendary) has a specific build amount, cooldown, and the corresponding probability of building different battle card rarity levels.
