Hello. There is a bug in Stonecore if you kill the last boss, High Priestess Azil while she is floating in the "add phase" that she will land underneath the ground so you can't loot her. I've managed to find a temporary fix if this happens to you so you will get the loot before Blizzard releases a bugfix on this.
Since I dont know how to macro it, I went into keybindings and binded a key to "Interact with target." Then use a "/target High Priestess Azil" and press your keybinding while walking behind the table on the platform, and you will be in range with her to loot her.
I don't know if I posted this in the right category but I think it's right.