Protector

Protectors are nodes that can be crafted and placed to protect the surrounding area. They prevent other players and mobs to dig or place nodes in a cube of 11 nodes, centered on the protector (a radius 5 nodes).

They come in two forms, a stone-like block, and a collisionless "logo". Each one can be crafted from the other one.

The protected area can be seen by hitting the protector (it won't work if holding a protector).