Circle of Power for Kurak’s Lair shows nothing in the crafting menu and can’t be opened, same problem for Liu Fei’s Circle of Power for when you need to do the ritual to free him. Been having this problem with Kurak’s Lair even before the Age of Heroes update.
Greetings @Anorak413 and welcome to the forums!
Thank you for reporting this issue to us, but could you please use the given Bug Report Template?
This template has most of the information we need to start investigating and will make the process a lot quicker for everyone 
You can find it here: NEW Bug Report Template
Thanks in advance!