Wear N' Tear is a Blender add-on from Sahin Ersoz for eroding models to give them a used, worn-out feel. You activate it by pressing F9, then pick Wear N' Tear HP for a realistic result or Wear N' Tear LP for a stylized look. Models can be eroded one at a time or several at once through multi-select.
Entire walls process at once, with no need to separate the bricks, stones or any part, and the add-on gives a fast real-time response. Models can be restored in whole or partially, down to a loose part, back to their original state as many times as needed, so there is no need to work non-destructively. Beyond erosion, you can cut cracks, cut parts off, add scratches, rip, tear and shred.
The Pro features add mortar between stones or bricks and cover models with plaster, which can also build landscapes. A newer addition brings procedural textures. Practice scenes with step-by-step instructions and documentation are included, and a demo video is available.