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"You are about 5 years too early to face me! Muahaha!
The whole fight made me think, 'Make a flashbang out of lightning or something.' A bit silly, I know but I think would help complement his skill set.
It's not that giving this information now instead of when the weapon was introduced is the flaw. The fault lies in the delivery of this world building being constantly centered around the MC. Either this info could have been delivered already in exposition considering how impactful this seems for world building. Or the MC could have learned of it later and simply be awed by such an ability. It's understandably difficult to show rather than tell in a novel format, but when two pieces of major world building get dumped out like this the immersion is broken for the mind just to try and catch up to the story to speculate on their implications rather than experiencing it first and receiving an explanation after, although it's admittedly complex to shape a narrative this way given the concerns you need to keep in mind such as avoiding plot holes.