In F/Z, Zouken made Kariya encite extra lines in the incantation in order to add the "Berserk" property to his servant. Was this to make sure he would get Berserker as a servant, or to increase his servants strength? If it's the latter, what is the terms of conditions of adding extra properties to servants? I don't see any reason not to do it, but the only master that did it was Kariya.
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