the anti-build block is a technical Block that can be found in Ur-Ghast towers which ensures that every brokenblock in his radius (5-10 blocks) will be replaced by a copy of himself. Another function is that every placed block in his radius will dissappear after a few moments so that's nearby impossible to cheat in a Ghast-tower becauce you'll die at the try of symply building up yourself with blocks. Be carefull with this block!
2013-10-18 13.10.34

left side: anti-builder right side:anti-build block

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