also, is not the regeneration/Immortality of sonic due to his strange and unique connection to the Chaos Force?
He doesn't have a connection to the Chaos Force like Flash. I know you are thinking of the FateHax but the FateHax surpasses the Chaos Force and its only assumed by us it has connection to Chaos Energy.
Sonic is just naturally gifted in combat and control over Chaos Energy, not an inherent connection like Tails the Chosen One or Knuckles the Living Chaos Emerald.
When did Sonic regenerate from anti matter?
Pre-1 Billion Ring, as Sally doesn't have her vest in the timeline
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Dr. Robotnik noting his plan to use Anti-Matter to creating an invisible army wasn't working cause
he was erasing them and they weren't coming back, let alone touch anything.
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antimatter works on a spiritual level
Power Rings can protect and restore the spiritual level
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Sonic's 1BR isn't note to be more powerful than a normal Power, just noted to give Sonic a protective aura. With a Chaos Emerald embedded into Mogul's Chest, he should have a greater protection, since more Chaos Energy multiples Hax and Resistence to bypass each other.
passively drains energy from the target
1. Would that matter since a single Pre-Harmony Emerald has an infinite amount of energy?
2. Since, tbh, Mogul's base is a composite, since we have yet to separate the difference between Pre- and Post- Great Harmony Emeralds and Great Harmony's scaling chain would go into Mogul's Base(for 1 Post-Harmony Emerald). That means his Post-Harmony Emerald is Infinite(Chaos Emerald energy) X the massively uncountable amount of infinite from the merge of the Great Harmony