Diabolist class not available

iPad air

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I finished the class quest for the new Diabolist class. The program crashed. When I returned, the class was not opened, and the program would not let me replay the final battle. The class cannot be accessed.

How often does this happen? When did it begin happening?
REPLACE THIS TEXT WITH YOUR ISSUE. e.g. Was this a once-off bug or has it been a consistent issue? Does it only happen after doing a particular game mode?

Steps to make it happen again
REPLACE THIS TEXT WITH YOUR ISSUE. e.g. Sometimes there are certain steps that can lead to a problem that may not be obvious! Example: I lose once in the Arena, I then exit to the world map, select broken Spire on the Map and enter Arena. broken spire’s quest lost instead.