Reason for the lightning in 666.

[Angelic.]

theres no sun or lightbulbs in kamui so it gets spooky

 

[Kurama The Kitsune Demon]

u do know this is old and was on the forums within the week 666 came out right??

 

[BloodSeed]

fail i was expecting raikiri

 

[VongolaX]

Or possibly Lighting. :| y'all are wrong just saying

No.... :|

This is what lightning means:

A occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.

So you are the one that is wrong