Is the keystone a way to get underground to dungeons or things of that nature? Under the temples/lodges/killroom buildings? It is the top of an arch and notice the picture with the arch and eye lighting. Says the entrance. To an underground place?
in the picture of the grave and the fez wearing skeleton. There is a TOMBSTONE. That is what i believe the keystone is. A designation maybe of an underground access. To places of satanic masonic violence.
in the initiation ritual to the shrine(the same one that makes them swear an oath to allah and go through something called the bunghole test, electrocuted etc.).i remember reading it said to have someone dress in a skeleton costume.whatever that would be i think its like pic related. Kind of common sometimes.