From your description, it has to be realized within the same project.
Not a beautiful solution, but it could work. You have to take the Field Security Plugin. Then you have to declare two groups of fields/custom fields. The one are only readable (Epic) for a specific role(epic writer, defect writer), the others read and writable (Defects). If only one of the readable is mandatory and the user is in the role "defect writer only", then the user cannot create an Epic.
Everything below is tested on Ubuntu 17.10. I prefer to use Jira in a docker container because: 1. I can install Jira with a couple of commands. 2. I can start and stop Jira just by starting and s...
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