ラムダデルタ, Lambda, Witch of Certainty, Witch of Absolute
She is also known as the Most Powerful Witch in the Universe before losing to Bernkastel and is feared by most other witches including Beatrice. She is quite childish and holds a grudge against Bernkastel for finally beating her in their last game although she actually cares for her. Her Magic of Certainty allows her to kill anyone without fail as an absolute result which bends the basic rule of Umineko magic requiring a risk. Like Bernkastel she is a Voyager. She wishes for Battler and Beatrice to fight against each other for eternity as a part of a larger plot to have Bernkastel lose against her. She has lived for a thousand years. As a witch she embodies the concept that hardworkers are rewarded and is very respected even by human beings. She doesnt flee from the human concept of witch. Hence the power of hers who is a being respected by human beings is immeasurable. However she is whimsical about whose efforts she will reward and in many situations the person who can please her more will be able to receive her smile. Her tremendous and swiftly fierce power makes any kind of witch surrender in a moment. However she seems to be reckless and it was thoroughly read by Bernkastel.