A space to work in that is well closed off, preferably constructed of something solid like stone, warded, and well used for magic and best out of the way of any bystanders. I will need blood undoubtedly, but I can provide that myself.

[There were few things more potently magical than Servant's blood, but she wasn't able to provide an alternate as easily as a male Servant would. Besides, blood was more appropriate for life and death magic.]

The space being made of stone isn't quite as important as being closed off, however. And I will need him. The chances of anything I attempt being very dangerous are high.