Witches are highly susceptible to 'magic-resisting toxin'. That is, the disbelief in magic. If enough people believe, Beatrice is capable of achieving miracle. However, if there are people filled with 'toxin', unbelief, Beatrice's very body is in danger of disappearing. During the games, she lowered disbelief by making small tricks and making it seem like magic, which eventually led people to question themselves, until she was able to appear in front of others.

Another weakness is boredom. Since a witch can do anything, she quickly becomes bored, and her life loses meaning, therefore she ceases to exist. This is the illness that all witches carry.

Now, weaknesses that are Beatrice specific are spider, and in turn, spider webs and mirrors. The spiders and spiderwebs are because of a legend concerning the Rokkenjima island, which is said to be inhabited by demons who were weak to spiders and their webs. Yasu decided to give this weakness to Beatrice. Things that are spider shaped, such as drawing, or a charm, will weaken or even burn her. Beatrice is also weak to mirrors because, no matter how hard she believes that she is the great witch Beatrice, all that will be reflected is the pitiful face of Yasu, and thus dispelling her magic. Mirrors could be anything that reflects an image, although this does not mean that her reflection in, for example, sunglasses, will weaken her. She has to see the object first.

It is often commented that Beatrice's potential as a witch is enormous and that she holds a deep power that she doesn't recognize herself. If great witches like Bernkastel and Lambdadelta admit that her powers are fearsome, then she really must be!

Endless Magic:

• As the Endless Witch, Beatrice has the ability to control the life and death of anything, including repeating objects and changing their fate completely. For example, a vase that was broken might be repaired by a lesser witch, but only for a limited amount of time since ‘fate’ will eventually break it again through some other event. However, Beatrice’s repairs will be permanent, thus changing its fate of breaking as well.

• She can also create any sort of illusion and has mastered creating and destroying the concept of eternity and infinity itself.

• She has been seen to take huge amounts of damage and survive, such as when she was impaled by several spears by Virgillia only to stand up and heal herself easily.

Summoning:

• Can summon: The Stakes of Purgatory, The Siesta Sisters, her butler Ronove, and multiple goat attendants. She is also able to summon the giants that use shields of Hephaestus for protection, and The “Shoulder Towers” which are extremely tall and fire an incredible amount of spears of light.

Simple Magic:

• She can levitate in the air, teleport, and turn into a swarm of golden butterflies. Make tea out of nowhere, make candy fall from the sky, among other things. Simple, cliche magic which is (usually) used to make people happy.

Truths:

• She is able to utilize the red truth, which states facts that cannot be argued against, but loopholes can be used around it. For example, "Lisa was in the room and didn't see anything.", but Lisa could be blindfolded! This is a trick a witch uses to confuse her opponent and make him submit to her, by making him think that there was no way such a thing could happen if a witch didn't do it. Only witches can use the red truth.

• The blue truth, which is used to theorize against a witch. For example, "Lisa could've been blindfolded, therefore it's possible for someone to do it."

• Once she fully 'understands' a game board, such as her own, she is able to use the golden truth, which is the 100% truth and no loopholes can be found. "Lisa's eyes were open the entire time!"

Alchemy:

• Can create gold and other objects out of thin air. However, creating gold at the moment is unavailable due to the contract she made with Kinzo.