The sphere Isaac produced was the Infinite Demon God Armor, which he had stolen from Princess Philo. It was one of the legendary Ten Great Demon Gods Demonic Puppets and possessed the ability of nearly Infinite Evolution!
Donning this magic armor-type Demonic Puppet would grant one power on par with a Demon God!
Of course, that was a thing of the past. The current Infinite Demon God Armor had long since been wrecked. Forget its former might that rivaled a Demon God; it had even lost its most fundamental core ability, Infinite Evolution.
Perhaps this was also why Philo, who was only an Official Wizard at the time, was able to possess it.
And so, despite the item's immense fame, Isaac had never used it after obtaining it. This was simply because it was too severely damaged, and as for repairing it…
'To be honest, Isaac didn't have the ability to do so…'
