I bought 5 Obelisks from Rhakotis General Store to complete my Pyramid Area but I got a "required to build Obelisk." message when I wanted to build it. The description of the item isn't list any build materials. I searched in the database what are those materials in normal cases and put them (6 Granite Stones, 5 Scrolls and 2 Giza Limestones) into my warehouses. After that I can built them but these materials weren't consumed. So, I can build them for free as the description said but I must have the materials in my warehouses. This is the same issue what @Flutters mentioned in Discord.