Use Indestructible blocks for dungeons

[Fi0x]

Is your feature request related to a problem? If yes, describe the problem.
You can dig in and out of dungeons at any point

Describe the feature you'd like
Use the already existing dungeon bricks for the dungeon structures

Describe alternatives you've considered
Create a "Force Field", like the warded blocks in thaumcraft, that prevents block destruction

Additional context
Warded blocks could also be used as spells and for other block types