This is a small mod created upon FTB request (however, you're welcome to use it yourself).
It adds a Clay Pickaxe, Shovel and Axe, crafted out of compressed clay blocks, with the following balance decisions:
- they can mine forever at diamond level,
- they cannot harm any mobs,
- they cannot be enchanted in any way.
For the default crafting recipe, Preston is required - you can configure the level of compressed clay blocks required in the config. (If 0, Preston is no longer required!)