SCP-096 is Euclid because if you did the box test (if you leave it in a box and nothing happens, it’s safe. If you leave it in a box and it would need to be checked on, it’s euclid. If you leave it in a box and it escapes, it’s keter. If it is the box, it’s thaumiel.) that’s what it would end up being. It might actually be closer to safe than keter when you think of it that way.