Heptagon Invisible Barrier

A very powerful and durable heptagon barrier with semi-sphere roof and base which can be erected to make anything confined invisible. It is invented by Royal Prodigies for the purpose of hiding their country, a moving island. To make a long-term invisible barrier, seven chakra receivers are planted on the edge of the island to form a heptagon-shaped barrier. Then, the users will channel their chakra through linked receivers remotely. For a short period of invisible barrier, it requires seven users stand still in heptagon position and channel their chakra to hold the barrier.