Exactly when do the Headstones from arena for Buried Bones Dragon become unavailable?

Thanks in advance for the information.

10:30am PDT Friday, 11/3

Thank You
As long as it's not 12.
:cool:

Crud, I wishI had seen this earlier. I rush in to battle for my final tombstone, get it, hit "view in storage" ... aaaaaand they're all gone! No buried bones dragon for me after all that work!!!