Nano Machines
Like the appearances of their Yugande-me, each of the members of the Mitsuorugi Clan have their own unique swarm of nano machines. Raiden's take the shape of bumblebees, but are infinately smaller. The main function of these nanos is to syphon the chakra out of anything and everything they are targeted at, and to transfer said chakra to Raiden himself. That said, the nano machines have no chakra themselves, meaning that they can't be found by sensory shinobi techniques.
Explosive Nano Pockets: Given their miniscule size, these little buggers can grip onto specific air molecules and pull them into a single pocket of combustable air. The longer they are left to work, the bigger the resulting explosion(s). Just because they have to deal with air moleules, doesn't mean that the explosions only deal with the air. Because of their size, they can displace other molecules enough to create explosive pockets underwater and even in some, if not all, solid surfaces. This is a very good method of entry into unknown places while startling enemies.
CamoNano: Because of their own lack of chakra, once they completely cover his being, Raiden becomes undetectable by any means of chakra sensing.
Explosive Nano Pockets: Given their miniscule size, these little buggers can grip onto specific air molecules and pull them into a single pocket of combustable air. The longer they are left to work, the bigger the resulting explosion(s). Just because they have to deal with air moleules, doesn't mean that the explosions only deal with the air. Because of their size, they can displace other molecules enough to create explosive pockets underwater and even in some, if not all, solid surfaces. This is a very good method of entry into unknown places while startling enemies.
CamoNano: Because of their own lack of chakra, once they completely cover his being, Raiden becomes undetectable by any means of chakra sensing.