Board Thread:Dark Souls/@comment-63.153.23.3-20130729052232/@comment-5178514-20130901101112

Yeah, slabs are rare indeed, I think you can get minimum 3 per playthrough: you get one for completing Siegmeyer's and Sieglinde's questline correlty, and it is quite complex, you find one in the Prepare to Die Edition new content, in a chest at the waterfall at the battle with Black Dragon Kalameet, and one if you defeat the Stray Demon. Only 3 per playthrough I believe.