Twenty Layer Barrier

A technique created by Kasuka Hakkō, the user creates a massive barrier made up of twenty layers each harder than the last. While incapable of repairing itself, this barrier can absorb its user's chakra in order to harden its layers allowing them to take even more punishment before an individual layer breaks. Using this technique during the Third Shinobi World War allowed Kasuka to single handedly force of Konoha shinobi to retreat when they found it impossible to defeat the barrier. She would later teach the technique to Izuka Santengeki.