Daath is a false Sephira. It resides in the Abyss. It has no direct Tarot attribution.
It is important to explain the Position of Daath or Knowledge upon the Tree. It is called the Child of Chokmah and Binah, but it hath no Place. But it is really the Apex of a Pyramid of which the three first Numbers form the Base.
Now the Tree, or Minutum Mundum, is a Figure in a Plane of a solid Universe. Daath, being above the Plane, is therefore a Figure of a Force in four Dimensions, and thus it is the Object of the Magnum Opus. The three Paths which connect it with the First Trinity are the three lost Letters or Fathers of the Hebrew Alphabet.
In Daath is said to be the Head of the great Serpent Nechesh or Leviathan, called Evil to conceal its Holiness. (שחנ = 358 = חישמ , the Messiah or Redeemer, and ךתיול = 496 = תוכלמ , the Bride.) It is identical with he Kundalini of the Hindu Philosophy, the Kwan-se-on of the Mongolian Peoples, and means the magical Force in Man.