Open Modular Passive Defence

Ever wanted to harden your bases defense were disappointed by only obsidian to be a block hard enough to be good against explosions and mining? Wanted to have wire barb fences around your home? This mods adds several tiers of walls, blocks and fences.
The fences only attack other players/mobs, not the person that placed it.

OMlib has a tool that can be used to instantly mine those blocks, too, if you are their owner.