These are sample domains. Ylsrim is from Nightmare V. It is kept for historical and sentimental reasons. It can be safely deleted. Praxis is from Nightmare 3. It is kept for historical and sentimental reasons. It can be safely deleted. The rest contain important examples and should not be deleted unless you know exactly what this means. Please see the following URL for a more detailed explanation: http://dead-souls.net/ds-admin-faq.html#138 oogtopia, voluntaria, and begin are the new domains for the game