Warded Stone

Warded Stone blocks are added by Thaumcraft, possibly with SMP in mind. They are essentially blocks that remember who placed them - and they are unbreakable by anyone but that player.

When paired with Arcane Doors, a player is able to construct a fort that is impervious to outside interference - including other players!

Advanced Uses
They are (almost*) literally indestructable to anyone but the player who placed them. Even IC2 Nukes cannot even destroy these blocks - when a set of 9 nukes was detonated inside a chamber composed of one-block-thick walls of Warded Stone, no terrain was damaged at all. They will not absorb the radiation effect, however, so bear this in mind.

Other players have been known to encase your impervious base with their own impervious blocks, preventing you from leaving your base. The Portable Hole is NOT able to tunnel through these blocks

Thaumonomicon Entry
These stone blocks are almost unbreakable to anyone except the person who placed them. What is more, they are highly resistant to explosions.

They come in a variety of colours to please even the most fashion conscious thaumaturge.

Research Details
Required Research is Unified Thaumic Field Theory. This unlocks with the Warded Stone and Doors Research

Crafting
The image to the right demonstrates the recipe (note, obscured in the image is the cost of 10 Vis). To get any manner of color, simply substitute the color you wish to achieve in where the bonemeal would go.

Bugs
Possibly a bug, but Red Power block breakers are able to dislodge them as if they were normal blocks, while pistons cannot budge them. Buildcraft Quarries are also capable of destroying them in the initial clearing phase, as well as in the mining phase. In theory this means that other machines that would clear out areas (such as Forestry machines or the Buildcraft Builder) could also do the same.