Jutsu Fusion!

Name: Hardened Mud Prison Technique
Rank: B
Type: Supplementary
Sub-Class: Defensive
Element: Water & Earth (Mud?)
Range: Short 0-5m
Charge Time: 3 posts
Duration: 3 posts
Chakra Cost: 8 points
Description: Rai combines Water Prison Technique and Earth Style Wall to create this jutsu. He does the hand signs for both and uses Water Prison Technique first. When the sphere of water is almost complete he uses Earth Style Wall and spits the mud into the sphere and it floats around the sphere. After a few moments it hardens and forms a hard coat of hard mud that makes it hard to break on the inside and outside. Rai leaves a hole where his arm is large enough for him to quickly squeeze in so he can use the sphere to protect him. Since he created the sphere he is able to move freely inside of it. Combining jutsu’s is hard to due and may fail if not done correctly. Rai isn’t the only one able to combine jutsu’s, anyone can learn how but it is quite hard to learn.
Points Spent: 15

I don't see anything wrong with it ^^
So, approved.