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Briefly, what is this ending about:

Memorial Infinite (Infinite's Replica) instead of Dr. Golden "Preparation" defeats Silent "The Player" and absorbs her inside the Phantom Ruby.
In this way, he resurrects himself as a True Infinite and becomes immortal by using Silent's "Memory".
He becomes "The One" with "The Player" and receives a new name: Immunity.
"The Player" becomes a Booster for Infinite, enchanting abilities and statistics with hers emotions - Cry, Terror and FEAR.
In this way also, Shadow the Hedgehog who was inside Silent's "Concord Gem" Bracelet as a "Summonable Comrade", became the "Forgotten One" due to
"The Players" imprisonment, which also went to the benefit for Infinite.
(The remaining Security Guards who were hidden in the Bracelets, accompanying Silent "The Player", also turned into "Forgotten Ones").
Now, Immunity decides to leave FNaS: Fiercy Forces Virtual World and take revenge on Real Sonic, who is in the Sonic Forces "Different Dimension" Real World probably on his another adventure...