Core objective

Build your realm, summon mythical forces, collect Eterna fragments, and restore the XDO Empire. Progress through campaign realms, defeat bosses, and unlock the Final Realm.

World structure (for engineering)

The game spans five core realms. Each realm includes one boss, ten creature card types, five spells/abilities, and a unique biome.

Card system

Each card has Level, Attack, Defense, Cost (XDO Energy), Ability, and Rarity: Common, Rare, Epic, Legendary, Mythic.

{
  "name": "Griffon Lord",
  "realm": "Grifforia",
  "attack": 900,
  "defense": 100,
  "cost": 4,
  "rarity": "Legendary",
  "ability": "Sky Dominance",
  "description": "A majestic sky beast empowered by the Core energy."
}

XDO energy system

• Round 1: 3 energy
• Per round: +1 energy up to a maximum of 10
• Summoning: Cards consume energy equal to their cost

This system is expandable to Play-to-Earn/Pay-to-Earn integrations.

Combat mechanics

Card-vs-card resolution:

1. Compare Attack vs Defense: If A.Attack > B.Defense → B is destroyed.
2. Element advantages: Certain elements counter others.

Campaign progression

1. Conquer five realms
2. Defeat each realm boss
3. Collect five Eterna Core fragments
4. Assemble the true Core
5. Enter the Final Realm
6. Defeat Xerathion, World-Ender

Online PvP

• Deck-based matchmaking: Skill- and power-aware pairing
• Rank progression: Score by deck strength and win rate
• Rewards: XDO tokens, Epic cards, Limited Edition NFTs

Card crafting

• 3 × Common → 1 × Rare
• 3 × Rare → 1 × Epic

Crafting supports progression pacing and in-game economy.

Endgame and empire mode

Activate the Eterna Core to restore the XDO Empire. Earn the title “Emperor of the Eternal Realm” and unlock the Conquest Mode to challenge and claim other players’ realms. This metagame is known as XDO EMPIRE.

Developer hooks