All of the magic of the Umineko no Naku Koro ni universe shall be based on the existence of a clear theory and ideas. From this fact, it is one of the elements that are required to the reasoning player explore the identity of what is self-described as magic.
Magic (魔法 Mahō ) is a supernatural force that witches, sorcerers and demons use. It also looks like the power to turn the impossible into possible and, in fact, is divided into several compendium of magic, and its effects appears to be different for each system.
Endless (無限 Mugen ) is the title of the compendium of magic used by the Golden and Endless Witch Beatrice and has the power to restore an object endlessly granting the witch/sorcerer the power to kill someone many times by restoring the victim to its previous state.
Miracle (奇跡 Kiseki ) is the title of the compendium of magic used by the Witch of Miracles Bernkastel. It consists in repeating events many times to reach a miracle as result, as long as the probability of this miracle is not a perfect 0%.
Absolute (絶対 Zettai ) is the title of the compendium of magic used by the Witch of Certainty Lambdadelta. It consists in magically rewarding the efforts of someone by bringing absolute results.