Dragon invasion

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Rules

 * The hero attack dragon will get +200% damage when this hero is in the same Legion with the dragon.
 * The hero attack dragon will get -80% damage when this hero is different Legion with the dragon.
 * The player that attacks the dragon first, or deals the killing blow will receive fantastic prizes.
 * All prizes will be received once the dragon dies, or runs away.
 * All players involved in the fighting can receive rewards based on the cumulative damage they dealt to the dragon.
 * The top 3 players will get an extra and the player who kills the dragon will receive all rewards and an upgrade.
 * Players will retain 80% of their troops each time they fight the dragon.
 * Players should wait 30 seconds after a failed attempt before fighting the dragon again.
 * The dragon will refresh every 23 hours.
 * The dragon will run away if it has not been killed or refresh 20 minutes later.
 * The dragon becomes increasingly powerful each time it is killed
 * The dragon becomes weaker if it has not been killed for 3 times continuously.