[3] In order to succeed at a task, the player must roll percentile dice equal to or lower than the character's relevant skill level (to which the referee may have added situational modifiers.
[3] The magic system is complex, and unlike many other role-playing games, successful spell completion is difficult to accomplish.
Characters must also learn to practice the arcane arts in private, lest they come to the attention of the secretive Fraternitas Vera Lucis (in this role-playing universe, the antecedent of the Inquisition).
First, Smith felt the American public was not ready for a game where the Spanish title translates as a ceremony for calling up major demons.
Secondly, he felt "another stumbling block for American publishers, in regards to the art, is occasional full frontal nudity, both female and male."
Thirdly, he felt the American public was not ready for a game where almost half of the book was dedicated to explicitly worded magical spells such as "Sexual Attraction" and demon summoning.