Jutsu to be learned: Earth Style: Iron Skin
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After taking his reward for a mission well done, Raiden went back to his house stopping along the way to buy some ramen from the legendary Ichiraku ramen stand. Apparently Naruto Uzumaki had been known to frequent the place often when he was young and even later on in his life. He had a couple bowls before paying the bill and continuing on his way. Once inside his house he thought about how bad it would have been if that bird from his diplomatic mission had hit him from behind and decided that he would try and find a way to protect himself should a similar situation occur.
So he went to the store after locking the door and looked around until he came across a scroll labeled, "Earth Style: Iron Skin." Seeing as how it epitomized what he was looking for he took it to the clerk at the counter and bought it, at a higher then normal price but he figured it was worth being overcharged, and figured himself lucky that they hadn't really looked at what he bought or they might have charged more.
Once back at home, he proceeded to open the scroll and look at the description: "The user flows chakra through all parts of their body, which hardens their skin to a steel-like quality. This increases their defensive power to the utmost limits. The user's skin becomes much darker, an almost black color. Furthermore, the destructive power of physical attacks is increased, making this a great all-purpose technique." Raiden shook his head, "This is gonna take a while. At least it only has one hand seal."
Cracking his knuckles, Raiden went out into his backyard and started chakra flow exercises that were included in the scroll.