File:Obsidian Shield.png

An example of an obsidian blast shield, with a lever activating a TNT formation looking like a creeper face. it shows that since obsidian is one of the most powerful blocks in the game, not including bedrock, it will not break easily and protect your animals, items, and most important, your house. imagine if all that TNT couldn't blow the obsidian up. Than think of what a few creepers could do, nothing right.