Each time a player upgrades a Card skill, their body must endure an infusion from the Card's Spirituality.
If there's no way to eliminate this influence, traitor cells will begin to appear in the player's body.
With each successive skill upgrade, these traitor cells thrive, growing increasingly distinct from the player's own cells.
Initially, this is merely a latent threat. As long as the Card doesn't spiral out of control, the traitor cells won't trigger a Rebound against their host.
However, the game-wide tremors that occur each round provide the perfect opportunity for these traitor cells to revolt.
The moment those death row inmates, steeped in Sin, entered the game's range, they triggered an instinctual reaction from the Azure-headed Demon Dragon's power.
And this instinctual reaction to Sin from the Azure-headed Demon Dragon was precisely what the Heaven-Reaching Giant wanted to Devour.
Only by completely Devouring this instinct could it seize total control.
